Seachem MetroPlex Parasitic and Bacterial Treatment 0.2-oz
Designed to treat a range of protozoan and anaerobic bacterial diseases in fish, including Cryptocaryon, Hexamita, and Ichthyophthirius, MetroPlex contains 70% metronidazole as its active ingredient. It is effective against both internal and external infections.
Available for direct dosing into aquarium water or by mixing with food, MetroPlex is suitable for use in tanks with invertebrates. When mixed into medicated food, it does not harm sensitive invertebrate species.
Known for its safety and low risk of overdosing, MetroPlex is gentle on fish and does not negatively impact the biological filter.
| Active Ingredient | Metronidazole (70%) |
|---|---|
| Target Diseases | Cryptocaryon, Hexamita, Ichthyophthirius |
| Usage Methods | Direct water dosing or mixed with food |
| Compatibility | Safe for use in tanks with invertebrates |
FAQ
Can MetroPlex be used in tanks with shrimp or snails?
Yes, MetroPlex can be safely mixed into medicated food without harming invertebrates like shrimp or snails.
How should I administer MetroPlex for best results?
You can dose it directly into the aquarium water or mix it with fish food. For internal infections, mixing with food is often more effective.
Does MetroPlex affect the biological filter?
No, MetroPlex does not adversely affect the biological filter.



Simon Springer –
Used MetroPlex to treat a Hexamita outbreak in my community tank. The fish showed improvement within a week. I mixed it with their food, which made it easier to administer. No harm to my snails or shrimp. Very effective and safe.
Victoria Watson –
Tried it for a Cryptocaryon case. Followed the dosage instructions and saw results after two weeks. The medication didn’t stress the fish or affect the filter. Good for both internal and external issues.
Christian McLean –
My betta had a bacterial infection. Used MetroPlex mixed with food. After three days, the fish started acting normally. No side effects. Works well in a mixed-species tank with invertebrates.