This morning, I realised that one of my ram's had very rapid gill movements. I already changed 50% of the tank water. However, the situation did not seem to improve. I already isolated it just in case it had gill parasites on it. Can anyone please advise me on what to do? I heard that rams are sensitive to some medication so I did not put any into the isolation tank. The isolation tank contains a few plastic plants, a cave and no substrate. I also added asmall sponge filter to keep the water clean.