I have a new 40 gallon breeder tank. It has been up and running for about 4 months now and all chemicals readings are good. I have a Power Whisper 30 filter (30 gallon) and a Penguin 200 filter (50 gallon) and a Maxi-jet 600 powerhead (160 GPH) in the tank, there was also some driftwood in the tank that I have recently taken out. The tank temp is around 78 degrees F. I've tried 2 or 3 times in the past 6 weeks to add fish to the tank, usually tropical fish, but everytime I add them within hours their fins and tails turn white and they die. I've tried everything I can think of to help the situation from water changes to Ick and some other disease cures. Any help would be greatly appreciated, the plants look good but I would like some fish.