tank 1 150gallons with fluval fx5 filter , 3 clown knive fish, 1 redtail cat, 1 channel cat, 1 bullshark, 2 pictus cats, 2 african cichlids, 1 pleco, 1 synodontis, 2 pacus.
- Unless all these fish are tiny the gill curl will not go away. It is happening because the tank has to many large fish and no matter what you filter it with that volume of water can't cope with the amount of waste all those monsters produce. Hence you likely have very high Ammonia and Nitrates, which is causing the gill curl.