I am sorry Karl about your fish, I do know you need a much bigger tank. but that does not help your problem now.... I say test your water to see what they reveal. you may have had bad nitrates etc. 29 gallon tanks are not maed for large fish as yours are. that clown needs friends, they are not happy unless they have several. you will need a large tank for this. I hope you find out what the problem is, and that you will not let this discourage you from havign them ( cichlids ) again in the future. but remember, cichilids need a large tank. with lots of room to play and lots of hiding spots to.