---
product_id: 56310744
title: "Seachem Reef Advantage Magnesium, 300 g"
brand: "seachem"
price: "124 zł"
currency: PLN
in_stock: true
reviews_count: 10
category: "Seachem"
url: https://www.desertcart.pl/products/56310744-seachem-reef-advantage-magnesium-300-g
store_origin: PL
region: Poland
---

# No ammonia, safe for reefs Concentrated 300g powder Ionically balanced formula Seachem Reef Advantage Magnesium, 300 g

**Brand:** seachem
**Price:** 124 zł
**Availability:** ✅ In Stock

## Summary

> 🌊 Elevate your reef’s vitality with precision magnesium mastery!

## Quick Answers

- **What is this?** Seachem Reef Advantage Magnesium, 300 g by seachem
- **How much does it cost?** 124 zł with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/56310744-seachem-reef-advantage-magnesium-300-g)

## Best For

- seachem enthusiasts

## Why This Product

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

## Key Features

- • **Concentrated Power:** 300g of highly effective magnesium sulfate and sodium chloride blend for lasting results
- • **Easy Dosing Formula:** Simple 1 teaspoon per 20L dosing with online calculator support for perfect maintenance
- • **Ammonia-Free Assurance:** Formulated without ammonia to ensure a safe environment for sensitive marine life
- • **Coral Vitality Booster:** Supports vibrant coral growth and reef health with daily renewal dosing
- • **Precision Ionic Balance:** Maintains optimal magnesium levels to prevent ionic imbalance in reef tanks

## Overview

Seachem Reef Advantage Magnesium is a concentrated, ionically balanced magnesium supplement designed specifically for reef aquariums. This 300g powder blend contains magnesium sulfate and sodium chloride, free from ammonia, ensuring safe and effective maintenance of magnesium levels to promote coral health and prevent ionic imbalance. Easy to dose and renew daily, it’s trusted by reef enthusiasts to boost coral vitality and maintain pristine water chemistry.

## Description

Product Description Seachem Reef Advantage Magnesium 300G Ingredients magnesium sulfate, sodium chloride Directions Mix 1 teaspoon of Reef Advantage Magnesium per 20 liters of water. Renew every 24 hours or as needed. Box Contains water treatment

Review: Easy Reef Magnesium - Makes you magnesium go up, easy. There is a calculator on seachems website to figure out the dosage.
Review: Old results - I’ve noticed a big difference in my corals after daily dosing of magnesium. They obviously needed a bit more. Very happy

## Features

- Concentrated, blended, ionically balanced magnesium source
- Contains NO Ammonia
- Vitally important in preventing ionic imbalance
- Model number: 020424

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0002DGLPI |
| Allergen Information | Allergen-Free |
| Best Sellers Rank | 67,417 in Pet Supplies ( See Top 100 in Pet Supplies ) 676 in Aquarium Water Treatments |
| Brand | Seachem |
| Brand Name | Seachem |
| Customer Reviews | 4.6 out of 5 stars 352 Reviews |
| Global Trade Identification Number | 00000116063609 |
| Item Form | Powder |
| Item Weight | 0.3 Kilograms |
| Item form | Powder |
| Item weight | 0.3 Kilograms |
| Liquid Volume | 300 Millilitres |
| Liquid volume | 300 Millilitres |
| Manufacturer | Seachem |
| Manufacturer Part Number | 636 |
| Model Number | 636 |
| Pet Type | Fish |
| Target Species | Sea Fish |
| UPC | 000116063609 780231493856 |

## Product Details

- **Brand:** Seachem
- **Liquid volume:** 300 Millilitres
- **Item weight:** 0.3 Kilograms
- **Item form:** Powder
- **Manufacturer:** Seachem

## Images

![Seachem Reef Advantage Magnesium, 300 g - Image 1](https://m.media-amazon.com/images/I/71GjvmGJoGL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Easy Reef Magnesium
*by M***L on 23 May 2026*

Makes you magnesium go up, easy. There is a calculator on seachems website to figure out the dosage.

### ⭐⭐⭐⭐⭐ Old results
*by M***. on 3 March 2023*

I’ve noticed a big difference in my corals after daily dosing of magnesium. They obviously needed a bit more. Very happy

### ⭐⭐⭐⭐⭐ Excellent product
*by J***. on 31 July 2023*

Does what it says on the tin

## Frequently Bought Together

- Seachem Reef Advantage Magnesium, 300 g
- Salifert Carbonate Hardness & Alkalinity (Kh/Alk) Test Kit, 100-200 Tests
- Salifert Phosphate Test Kit

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*Product available on Desertcart Poland*
*Store origin: PL*
*Last updated: 2026-09-22*