Ok, so I have a fifty five gallon tank that has been up and running for about 6 months. There are 10 four to five inch chiclids in it, and for they all seem to be happy. But I just cannot keep the water clean. This is my first tank so I am still learning. My tank was set up with the grates on the bottom and power heads, and I still had milky water issues. I was told to get rid of that and get a high quality hang on filter, wich I did. It has three stages to it, foam, carbon, and media rocks. I was performing 50% water changes every week to try and keep it clean, wich would work for about 2 days, then it would be white again. I was told that was to often so I cut it down to every other week, but that did not help. I have put cycle, or good bacteria supplement in the tank and that has not helped. It was bothering so bad the other day I did a big water change and that evening my fish were not looking to good, 1 died right away, another got white fungus all over and then died. I do rinse my media rocks off with tap water, just read that I shouldnt be doing that. I dont no what to do and I feel like just giving up. Oh yeah, have the test strips with 6 test on them, and everything looks great, thats another reason why I am feeling so confussed.