Well my tank had been fine for about 5 months. It has just started being cloudy for about 2 months, although all of my parameters are perfect (shown by water tests)
I noticed 4 days ago, that my pleco had ich, and 2 days later my angel fish died, and last night my pleco died. I'm not sure why though. I had been treating the water with AquaSafe Ich Tablets, but that's not the problem.