Enjoy fast, free delivery, exclusive deals, and award-winning movies & TV shows with Prime
Try Prime and start saving today with fast, free delivery

Get Fast, Free Shipping with Amazon Prime FREE Returns

FREE delivery Tuesday, May 7 on orders shipped by Amazon over $35

Or fastest delivery Thursday, May 2. Order within 4 hrs 5 mins

Select delivery location

Only 13 left in stock - order soon.

$$22.49 () Includes selected options. Includes initial monthly payment and selected options. Details

Enhancements you chose aren't available for this seller. Details

${cardName} not available for the seller you chose

${cardName} unavailable for quantities greater than ${maxQuantity}.

Ships from

Amazon

Ships from

Amazon

Sold by

What America Buys

Sold by

What America Buys

Returns

Eligible for Return, Refund or Replacement within 30 days of receipt

Returns

Eligible for Return, Refund or Replacement within 30 days of receipt

This item can be returned in its original condition for a full refund or replacement within 30 days of receipt.

Read full return policy

Payment

Secure transaction

Payment

Secure transaction

We work hard to protect your security and privacy. Our payment security system encrypts your information during transmission. We don’t share your credit card details with third-party sellers, and we don’t sell your information to others. Learn more

Details

Add a gift receipt for easy returns

FREE delivery Tuesday, May 7 on orders shipped by Amazon over $35

Or fastest delivery Thursday, May 2. Order within 4 hrs 5 mins

Only 13 left in stock - order soon.

Deliver every:

$$22.49 () Includes selected options. Includes initial monthly payment and selected options. Details

Enhancements you chose aren't available for this seller. Details

${cardName} not available for the seller you chose

${cardName} unavailable for quantities greater than ${maxQuantity}.

Auto-deliveries sold by What America Buys and Fulfilled by Amazon

Other sellers on Amazon

New (12) from $22.45 & FREE Shipping

Watch Before Buying Red Sea Calcium Foundation A !! Edward Payero

Image Unavailable

Image not available for
Color:

To view this video download Flash Player

Red Sea Reef Foundation A Supplement (Ca/Sr) - 500ml

Visit the Red Sea Store

4.7 227 ratings

Price:

$22.49 Get Fast, Free Shipping with Amazon Prime FREE Returns

Available at a lower price from other sellers that may not offer free Prime shipping.

{"desktop_buybox_group_1":[{"displayPrice":"$22.49","priceAmount":22.49,"currencySymbol":"$","integerValue":"22","decimalSeparator":".","fractionalValue":"49","symbolPosition":"left","hasSpace":false,"showFractionalPartIfEmpty":true,"offerListingId":"NCapUH2Q7qCfH8GGxYb6boLebyXrUZEnNyqhX2gQpNOrCRmkEo4UGtvzyYUGVxU81HIpHhKxblTtTuul44LLFr6A4wmirlOWZk8yg6cj6mpNYdkLDAJ%2BRoqE94O648EFS9mSY7Zb90v%2BkfQKQkyYNJdjEYKUr7OQEWbwKwjFr5%2Fye8JohyQtmQ%3D%3D","locale":"en-US","buyingOptionType":"NEW","aapiBuyingOptionIndex":0}, {"displayPrice":"$22.49","priceAmount":22.49,"currencySymbol":"$","integerValue":"22","decimalSeparator":".","fractionalValue":"49","symbolPosition":"left","hasSpace":false,"showFractionalPartIfEmpty":true,"offerListingId":null,"locale":"en-US","buyingOptionType":"SNS","aapiBuyingOptionIndex":1}]}

Purchase options and add-ons

Brand	Red Sea
Liquid Volume	500 Milliliters
Item Weight	0.77 Kilograms
Item Form	Liquid
Target Species	Coral

About this item

Red Sea Foundation A aquarium supplement
Part of Red Sea's Reef Care Program for optimal aquarium coral health
Contains blended salts of calcium and strontium in the ratio required by corals
Also contains magnesium, which helps support balanced formation of the coral skeleton
Add this liquid supplement to your aquarium daily to form the basic foundation of coral skeletons

Customer ratings by feature

Easy to use

5.0

Value for money

4.4

See all reviews

Report an issue with this product or seller

Frequently bought together

Red Sea Reef Foundation A Supplement (Ca/Sr) - 500ml

$22.51

Get it as soon as Tuesday, May 7

Only 13 left in stock - order soon.

Sold by What America Buys and ships from Amazon Fulfillment.

Red Sea Aqcult 306168 1 LTR Reefer Foundation B Alkalin

$26.50

Get it as soon as Tuesday, May 7

Only 2 left in stock - order soon.

Sold by S.E. Retailers and ships from Amazon Fulfillment.

Red Sea Reef Foundation C, Magnesium Supplement, 1 Liter

$27.57

Get it as soon as Monday, May 6

Only 10 left in stock - order soon.

Sold by Aserson and ships from Amazon Fulfillment.

Total price:

To see our price, add these items to your cart.

Try again!

Details

Added to Cart

Some of these items ship sooner than the others.

Show details Hide details

Choose items to buy together.

357
9 offers from $9.99
660
Amazon's Choice
in Aquarium Water Treatments
12 offers from $10.59
93
8 offers from $22.99
42
1 offer from $86.99
721
12 offers from $10.61
89
9 offers from $22.28

Product Description

A successful coral reef aquarium depends on how well you maintain the water parameters which are the key to a stable coral environment. All of the elements found in natural seawater play a role in providing optimal water parameters, but some are more significant than others. These elements, the foundation of the reef environment, include the three major elements: Calcium (Ca), Magnesium (Mg) and Carbonates (CO3). All three have a major effect on water chemistry (pH stability, Alkalinity, ionic strength) and on many of the coral’s biological processes (skeleton formation, ions exchange, photosynthesis). The foundation elements complement each other in the formation of coral skeleton. If not balanced correctly one of the elements will quickly limit healthy coral growth. Maintaining balanced levels of the Foundation Elements (Ca, KH Mg) creates optimal water conditions for promoting strong and healthy coral growth. Reef Foundation A is a Calcium Strontium complex for balanced formation of Coral Skeleton. Reef Foundation A: Contains Calcium, Strontium, and Barium according to the ratios found in coral skeleton. Concentration: 1ml will raise the Ca level of 100 liters (25 gal) by 2ppm.

Looking for specific info?

Product information

Item Weight

1.7 pounds

Manufacturer

Red Sea

ASIN

B004E47QSC

Item model number

Red Sea Reef Foundation A Supplement (Ca

Customer Reviews

4.7 227 ratings

4.7 out of 5 stars

Date First Available

August 18, 2004

Item Package Dimensions L x W x H

8.5 x 7.91 x 3.03 inches

Item Dimensions LxWxH

3.15 x 7.87 x 3.15 inches

Item Weight

0.77 Kilograms

Brand Name

Red Sea

Target Audience Keyword

fish, dogs

Directions

use as directed

Model Name

Red Sea Reef Foundation A Supplement (Ca/Sr) - 500ml

Size

Material

cotton

Age Range Description

Young Adult

Number of Items

Manufacturer

Red Sea

Specific Uses for Product

aquarium treatments

Feedback

Would you like to tell us about a lower price?

Product details

Is Discontinued By Manufacturer ‏ : ‎ No
Product Dimensions ‏ : ‎ 3.15 x 7.87 x 3.15 inches; 1.7 Pounds
Item model number ‏ : ‎ Red Sea Reef Foundation A Supplement (Ca
Date First Available ‏ : ‎ August 18, 2004
Manufacturer ‏ : ‎ Red Sea
ASIN ‏ : ‎ B004E47QSC

Best Sellers Rank: #75,479 in Pet Supplies (See Top 100 in Pet Supplies)
- #762 in Aquarium Water Treatments

Customer Reviews:
4.7 227 ratings

Important information

Directions

use as directed

Compare with similar items

	This Item Red Sea Reef Foundation A Supplement (Ca/Sr) - 500ml	Recommendations Continuum Aquatics Flora Viv K – Concentrated Potassium Supplement for Freshwater Planted Aquariums, 500-ml	dummy Red-Sea-Reef Foundation ABC, Combo Pack 1000ml Each, Includes Supplement-A (Ca/Sr), ARE22023 Supplement-B (Kh/Alkalinity), ARE22033 Magnesium Supplement-C + Exclusive Notepad	dummy Red Sea Trace Colors ABCD Pro Pack 4X 500mL	dummy Red Sea Reef Energy Plus 500ml (AB+) All in One Coral Food for Saltwater Aquarium Marine Reef Tanks \| Food for Soft, LPS, SPS, and Non-Photosynthetic Corals	dummy Seachem Reef Calcium 500ml
	Try again! Details Added to Cart	Try again! Details Added to Cart	Try again! Details Added to Cart	Try again! Details Added to Cart	Try again! Details Added to Cart	Try again! Details Added to Cart
Price	$22.51	$16.61	-8% $86.99 Typical: $94.99	$79.99	$29.99	$13.62
Delivery	Get it as soon as Tuesday, May 7	Get it as soon as Monday, May 6	Get it as soon as Monday, May 6	Get it May 8 - 13	Get it as soon as Wednesday, May 8	Get it as soon as Monday, May 6
Customer Ratings	4.7227	4.36	4.842	5.03	4.71,001	4.6357
Easy to use	5.0	—	5.0	—	4.2	4.0
Value for money	4.4	—	5.0	—	4.1	3.8
Sold By	What America Buys	Amazon.com	FREE 3 DAY ARRIVAL SHIPPING	ASAP-Aquarium	VerSure	Amazon.com
target species	Coral	—	—	—	Coral	Fish
liquid volume	500 milliliters	16.9 fluid ounces	1000 milliliters	500 milliliters	8.45 fluid ounces	500 milliliters
form	Liquid	—	Liquid	—	Liquid	Liquid
weight	0.77 kilograms	1.21 pounds	9.72 pounds	—	1 kilograms	0.6 kilograms

Customer reviews

4.7 out of 5

227 global ratings

How customer reviews and ratings work

Sort reviews by

Top reviews from the United States

Translate all reviews to English

There was a problem filtering reviews right now. Please try again later.

Me encantaron son súper cómodas !!

Lo mejor

Reviewed in the United States on September 23, 2023

Verified Purchase

Excelente y fácil de usar

Helpful

Translate review to English

Andre

Reef tank supplement

Reviewed in the United States on March 16, 2023

Verified Purchase

Excellent product. Using already few years Red sea products.

Helpful

Clarence A. Johnson

Works as promised

Reviewed in the United States on July 25, 2022

Verified Purchase

Noticed immediate improvement from corals all positive finally getting some noticeable growth from digitata and Chalice and everything else has had a positive noticeable response to the addition to this along with red sea ABCD color and growth enhancing line of reef supplements

Helpful

Tyler

Don’t follow instructions

Reviewed in the United States on November 12, 2022

Verified Purchase

If you follow instructions it will kill every fish In your tank. Begin with micro dose. It killed every fish I had except one.

2 people found this helpful

Helpful

Works as expected!

Reviewed in the United States on October 19, 2017

Verified Purchase

I just started my first reef aquarium a few months ago and noticed the other day that the calcium level in the water had dropped to 350 ppm. I measured the necessary amount of supplement according to the directions on the bottle and added it to the tank. Easy. I did another calcium tests a few minutes ago and the levels rose from 350 to 440 which is exactly what I wanted. Now that my calcium level is where I need it, I can just use this product to dose every week to keep the levels up. Highly recommend.

4 people found this helpful

Helpful

Jim

It was exactly what I needed.

Reviewed in the United States on January 15, 2022

Verified Purchase

I like the ease of use and the price.

Helpful

José Antonio

Original product

Reviewed in the United States on May 26, 2021

Verified Purchase