---
product_id: 14768618
title: "API MARINE CALCIUM Reef Aquarium Calcium Solution 16-Ounce Bottle"
brand: "api"
price: "S$32"
currency: SGD
in_stock: true
reviews_count: 8
category: "Api"
url: https://www.desertcart.sg/products/14768618-api-marine-calcium-reef-aquarium-calcium-solution-16-ounce-bottle
store_origin: SG
region: Singapore
---

# Maintains 400-500 ppm calcium Supports coral & invertebrate health Treats up to 948 gallons API MARINE CALCIUM Reef Aquarium Calcium Solution 16-Ounce Bottle

**Brand:** api
**Price:** S$32
**Availability:** ✅ In Stock

## Summary

> 🐠 Elevate your reef game—because your corals deserve the best!

## Quick Answers

- **What is this?** API MARINE CALCIUM Reef Aquarium Calcium Solution 16-Ounce Bottle by api
- **How much does it cost?** S$32 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/14768618-api-marine-calcium-reef-aquarium-calcium-solution-16-ounce-bottle)

## Best For

- api enthusiasts

## Why This Product

- Trusted api brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Trusted Legacy:** Backed by 50+ years of API innovation, ensuring reliable, research-driven aquarium care.
- • **Massive Coverage:** One 16 oz bottle treats nearly 1,000 gallons—long-lasting supply for serious reef keepers.
- • **Natural & Essential:** Provides a pure, natural calcium source critical for coral, snails, shrimp, and mollusk vitality.
- • **Vibrant Coral Colors:** Enhances natural coral pigmentation for a stunning, Instagram-worthy reef display.
- • **Precision Calcium Boost:** Easily maintain optimal 400-500 ppm calcium levels for thriving reef ecosystems.

## Overview

API MARINE CALCIUM is a premium 16-ounce calcium supplement designed to maintain ideal calcium levels (400-500 ppm) in reef aquariums. Supporting the health and vibrant coloration of corals and reef invertebrates, it treats up to 948 gallons of saltwater. Trusted by aquarists for over 50 years, this natural calcium source ensures your reef ecosystem thrives with minimal effort.

## Description

API MARINE CALCIUM supports health, growth, and vibrant coloration of corals in reef aquariums. Provides a natural source of essential calcium for healthier, more colorful corals and reef invertebrates, including snails, shrimp, crabs, clams, and mollusks, as well as coralline algae. The calcium concentration of a reef aquarium should be between 400-500 ppm. Use whenever testing shows a calcium level below 400 ppm. Dose according to directions on product label. Treats up to 948 US gallons of salt water. With API Aquarium products, it’s easy to keep a beautiful saltwater, freshwater or reef aquarium. For over 50 years, API has been creating innovative, research-driven solutions that make it easier to care for your fish and aquarium. API Aquarium Treatment Supplies are designed to work in conjunction with each other to provide best results to control algae, promote healthy bacterial growth and help control and cure fish diseases and conditions such as ich and fin rot. They work to provide a safe, hospitable environment for fish such as tropical community fish, cichlids, goldfish and more. With API, you can spend more time admiring your fish, and less time scrubbing your tank. Make sure to use all products as directed in order to ensure the best results.

Review: your snails will love calcium - my snails looks so much better after using this! i looked far and wide for a good calcium supplement to help out some of my snail tanks and their shells looks great. The bottle is large so it's going to last a very long time because you only need the tiniest bit each time. super easy to use and a very sturdy bottle i can bring around with me
Review: Works great - Works great

## Features

- Contains one (1) API MARINE CALCIUM Reef Aquarium Calcium Solution 16-Ounce Bottle
- For proper health and growth of corals
- Natural source of calcium
- Promotes vibrant colorations
- Use whenever testing shows a calcium level below 400 ppm

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0017JHBFU |
| ASIN  | B0017JHBFU |
| Best Sellers Rank | #52,228 in Pet Supplies ( See Top 100 in Pet Supplies ) #506 in Aquarium Water Treatments |
| Brand Name | API |
| Color | clear |
| Customer Reviews | 4.7 4.7 out of 5 stars (741) |
| Date First Available | April 8, 2008 |
| Date First Available  | April 8, 2008 |
| Directions | Use dosing cap on bottle. Shake well. Add 5 ml per 10 gallons (38 L) of aquarium water. Tips: In natural reefs, calcium levels are very stable and changes are gradual, so when adding calcium to an aquarium, it is advisable to raise calcium to the desired level over several days and not all at once. The calcium level gradually drops in reef aquariums as invertebrates utilize calcium in the water. S… |
| Is Discontinued By Manufacturer  | No |
| Item Dimensions LxWxH | 1 x 1 x 5 inches |
| Item Package Dimensions L x W x H | 9.29 x 8.43 x 2.4 inches |
| Item Weight | 6.4 ounces |
| Item model number | 330D |
| Item model number  | 330D |
| Manufacturer | Mars Fishcare |
| Manufacturer  | Mars Fishcare |
| Model Name | API MARINE CALCIUM 16 OZ |
| Number of Items | 1 |
| Product Dimensions  | 1 x 1 x 5 inches; 6.4 ounces |
| Size | 16 oz. |
| Style | Aquarium Treatment |
| Target Audience Keyword | Fish |

## Product Details

- **Brand:** API
- **Item Form:** Liquid
- **Item Weight:** 6.4 ounces
- **Liquid Volume:** 16 Fluid Ounces
- **Manufacturer:** Mars Fishcare

## Images

![API MARINE CALCIUM Reef Aquarium Calcium Solution 16-Ounce Bottle - Image 1](https://m.media-amazon.com/images/I/61fLuKcrNbL.jpg)

## Available Options

This product comes in different **Color, Size** options.

## Questions & Answers

**Q: Can this be used in freshwater aquariums to give mystery snails calcium?**
A: yes- I add some to my mystery snail tank- I've got about 6 in a 5 gallon tank.  I add it according to the prescribed dosage on the bottle with the hope that it will strengthen the shell.

**Q: Can i do this in a 3 gallon tank**
A: yes- the recommended dose is 5 ml/10 gal  (not positive- but in directions on bottle) so for a 3 gal tank you'd add 1.5 ml.  bottle has measurements on cap  i have a snail 3 gall tank with about 7 small nerite snails.  i always add some when doing a water change.  good luck!  Perry A.

**Q: Would this work for my Red Eared Slider tank?**
A: Yes, If you are looking to increase your calcium level or general hardness in your aquarium water this product will work.  To dose the aquarium use API General Hardness test kit or API Calcium Test kit to reach your desired level.

**Q: Can I use this product with a betta fish and a mystery snail in a freshwater tank?**
A: This is not harmful to fish. It does give necessary calcium for the snail. Make sure you are adding proper amounts according to container. This is what I use in my fresh water tanks for snails and shrimp.

## Customer Reviews

### ⭐⭐⭐⭐⭐ your snails will love calcium
*by C***N on March 23, 2021*

my snails looks so much better after using this! i looked far and wide for a good calcium supplement to help out some of my snail tanks and their shells looks great. The bottle is large so it's going to last a very long time because you only need the tiniest bit each time. super easy to use and a very sturdy bottle i can bring around with me

### ⭐⭐⭐⭐⭐ Works great
*by M***A on April 14, 2025*

Works great

### ⭐⭐⭐⭐⭐ Freshwater snails love it
*by M***E on August 22, 2021*

I bought this for my nerite and mystery snails, as their shells looked a bit damaged when I bought them. I tried cuttlebones, Tums, and crushed eggshells, also Wonder Shells, and nothing was working very well. After buying this product, I dose 5ml in 20gals weekly after 75% water changes. Freshwater aquarium. The snails are growing quickly, the mystery snail is now HUGE! The shrimp also appreciate it as well, I have been seeing more intact molts. Just keep in mind that minerals like calcium do not evaporate, so unless you are changing 100% of the water each time you add calcium (not recommended!), the concentration will increase. I check the kH and gH levels weekly as well to monitor this.

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-03-09*