Hello everyone first off cool website I really like it. Ok this is my situation when I started my 90 gallon tank I didn't cycly the tank. I am currently fileting my tank with a aquaclear 110, pinguin 330, and a fluval 304. At the begging as was under filterd and the amonia levels were off the roof, so I did this filtration setup. I have had the tank for 8 weeks and it is still not cycled properly the amonia lowered itself and the nitrite went high. The water looked real cloudy and smelled bad. So I did a 60% water change. I managed to lower the nitrite to a .25 and the water looked better but the next day It got cloudy again. Since I bought it was following all the guideline I've been told like doing 205 water changes every week. I have been battling to get the tank to look clean, but for some reason I can,t. I have 6" oscar, 2" jack, 2'" blood parrot and a tiger barb. My PH is reading at 72 and the amonia at .50, the nitrite is currently ay .25 and nitrate at 0. Please help I think that maybe I am not doing something right but I can't figure it out. To top it all off I think my oscar is showing symptoms of hole in the head. Any advice will be greatly appreciated.