Fauna Marin Red X Algae Control for Saltwater Aquariums
Fauna Marin Red X is a special liquid tonic for algae control in saltwater aquariums. It has a special formula that prevents algae growth in the aquarium. Red X safely treats unwanted algae in a biological / organic way and is very gentle to the aquarium inhabitants. When used correctly at the intended dosage, RED X is 100% safe to use and harmless to corals, fish and invertebrates.
Effective Against
- Green and Red Cyanobacteria
- Mild Dino flagellate infestation
- Gold & Armor algae
- Diatoms
Capacity & Coverage
| Volume | Treats (Litres) |
|---|---|
| 250ml Bottle | 400 |
| 500ml Bottle | 800 |
FAQ
How often should I use Fauna Marin Red X?
Follow the dosage instructions on the label. Use as needed based on algae growth, typically once every 1-2 weeks for maintenance.
Is Red X safe for corals and invertebrates?
Yes, when used at the correct dosage, Red X is 100% safe and harmless to corals, fish, and invertebrates.
Can I use Red X in a reef tank?
Yes, Red X is specifically formulated for saltwater aquariums and is safe for reef environments.

Evan Abraham –
I’ve used Red X for three months now and it has significantly reduced the green algae on my tank. My corals and fish seem unaffected. The 250ml bottle lasted about 4 months in my 300L tank. Easy to mix and no side effects.
Hannah Campbell –
It works well for diatoms and cyanobacteria. I applied it once a week and noticed a steady decline in algae. My tank looks cleaner now. A bit expensive but effective.
Ruth Simpson –
Great product for mild algae issues. No harm to my shrimp or anemones. The 500ml bottle covers my 800L tank perfectly. I’ve used it twice since adding it to my system.