Brightwell Magnesion - 500ml The heater is absolutely waterproof

The heater is absolutely waterproof

Features- Controllable DC pump

Efficient DesignThe air and water mixture then travels through Red Starfish’s proprietary diffusers

Beware of cheap pelletized carbon that is made for air purification and not for water

British Standard Pipe Threading

Brightwell Magnesion - 500ml The heater is absolutely waterproofConcentrated Magnesium Supplement for All Marine Fish & Reef Aquaria Overview Highly concentrated ionic magnesium solution. Provides magnesium, which helps regulate the balance between calcium and carbonates in aquarium water, and is a component of aragonite, the mineral secreted by reef building organisms such as corals, clams, and their allies to form skeletal material. Stronger than most competing products. Contains no unwanted organic material