I have a relatively new 75g tank with 20 juvenile African cichlids that is a few weeks old. 19 of the seem happy and healthy but one of them started just hanging out at the bottom of the tank the last few days and I haven't seen him eat in 2 days while the other fish go nuts at feeding time. He also doesn't swim around the tank like the others. He just seems to keep pace with the current and move around just a little bit as you can see in the video. He also seems to be working a bit harder at breathing than the rest. I'm new to keeping Cichlids so any suggestions would be appreciated!