Has anyone ever used this product? I'm having an issue with ammonia on my 3 month old tank. Ammonia stays around O.25. This tank was cycled but I am a newbie to fish keeping And I did the over feeding thing. I have vacuumed, vacuumed and have done water changes upon water changes. I just can't seem to get it under control. I thought I'd would try this product before I have to majorly rip the tank apart ( remove animals, wash gravel, etc.) My tank Is a 20h with 9 tetras (5 glow and 4 white skirts), 3 ghost shrimp and two tiger nerites. I'm concerned how it will effect the inverts. I tried contacting via email my question to Fluval but no answer yet.