---
product_id: 15414987
title: "CaribSea Coraline Aquarium Gravel, 20 lbs."
brand: "carib sea"
price: "$415"
currency: NZD
in_stock: true
reviews_count: 8
category: "Carib Sea"
url: https://www.desertcart.nz/products/15414987-caribsea-coraline-aquarium-gravel-20-lbs
store_origin: NZ
region: New Zealand
---

# Maintains stable pH 8.2 naturally Optimized nutrient & oxygen flow for bacteria 20 lbs premium coral-friendly gravel CaribSea Coraline Aquarium Gravel, 20 lbs.

**Brand:** carib sea
**Price:** $415
**Availability:** ✅ In Stock

## Summary

> 🌟 Elevate your reef game with gravel that works as hard as you do!

## Quick Answers

- **What is this?** CaribSea Coraline Aquarium Gravel, 20 lbs. by carib sea
- **How much does it cost?** $415 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/15414987-caribsea-coraline-aquarium-gravel-20-lbs)

## Best For

- carib sea enthusiasts

## Why This Product

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

## Key Features

- • **Natural pH Buffer:** Maintains ideal 8.2 pH balance without harsh chemicals—keep your ecosystem pristine.
- • **Algae Defense Layer:** Discourages nuisance algae growth, ensuring crystal-clear water and a stunning display.
- • **Coral Growth Catalyst:** Precisely graded gravel promotes vibrant coral health and reef vitality.
- • **Oxygen-Rich Substrate:** Engineered to prevent anaerobic dead zones, supporting beneficial nitrifying bacteria.
- • **Effortless Aquarium Clarity:** Resists packing and channeling for easy maintenance and long-lasting water clarity.

## Overview

CaribSea Coraline Aquarium Gravel is a 20 lb premium substrate designed to support coral growth by maintaining a stable pH of 8.2 naturally. Its precise grading ensures optimal nutrient and oxygen flow to beneficial bacteria, preventing anaerobic zones and discouraging algae growth. Ideal for reef tanks, it keeps water clear and healthy without constant chemical adjustments.

## Description

Aquarium gravel with precise grading to permit free flow of nutrients and oxygen to nitrifying bacteria. Keeps water clear. Resists packing channeling and anaerobic dead spots beneath decor.

Review: great product to use for coral reef - used it for a reef tank setup not easy cleaning dirt keep coming, good color and gravel size is not to large, value of this product same as retail shops, but it works and gives you great effects your water hardness or softness will change with time
Review: Gnat Killer - As described and good quality. Use it to cover the top layer of soil for my plants to prevent gnat infestations.

## Features

- Aids in the growth of corals
- Buffers for the life of the aquarium
- Helps maintain a proper pH of 8.2 without constant chemical additions
- Discourages nuisance algae growth

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00C5H0ESE |
| ASIN  | B00C5H0ESE |
| Best Sellers Rank | #69,415 in Pet Supplies ( See Top 100 in Pet Supplies ) #115 in Aquarium Gravel |
| Brand Name | Carib Sea |
| Color | Coral |
| Customer Reviews | 4.7 4.7 out of 5 stars (179) |
| Date First Available | April 2, 2013 |
| Date First Available  | April 2, 2013 |
| Department | Gravel & Substrates |
| Department  | Gravel & Substrates |
| Directions | See product label |
| Item Dimensions LxWxH | 18 x 12 x 2 inches |
| Item Package Dimensions L x W x H | 14.9 x 12.8 x 4.1 inches |
| Item Weight | 17.7 pounds |
| Item model number | FBA_101 |
| Item model number  | FBA_101 |
| Manufacturer | Carib Sea |
| Manufacturer  | Carib Sea |
| Manufacturer recommended age  | 1 month and up |
| Model Name | FBA_101 |
| Number of Items | 1 |
| Product Dimensions  | 18 x 12 x 2 inches; 17.7 Pounds |
| Size | 20lb |
| Specific Uses for Product | Decorative |
| Style | Classic |
| Target Audience Keyword | fish |

## Images

![CaribSea Coraline Aquarium Gravel, 20 lbs. - Image 1](https://m.media-amazon.com/images/I/61NC7DWlP-L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ great product to use for coral reef
*by R***I on December 19, 2025*

used it for a reef tank setup not easy cleaning dirt keep coming, good color and gravel size is not to large, value of this product same as retail shops, but it works and gives you great effects your water hardness or softness will change with time

### ⭐⭐⭐⭐⭐ Gnat Killer
*by K***R on December 15, 2025*

As described and good quality. Use it to cover the top layer of soil for my plants to prevent gnat infestations.

### ⭐⭐⭐⭐⭐ great for aquarium with natural properties
*by L***Y on May 13, 2024*

I discovered these for my aquarium and found that once rinsed they actual do help the minerals in the water and ph level naturally.

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**Shop now:** [https://www.desertcart.nz/products/15414987-caribsea-coraline-aquarium-gravel-20-lbs](https://www.desertcart.nz/products/15414987-caribsea-coraline-aquarium-gravel-20-lbs)

---

*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-26*