Could someone please give some possible reasons why the water in my 75G african cichlid peacock tank has been cloudy the past week!! The glass is clean, I do 2x weekly 20% water changes, we have well water and the PH is naturally right at 8, no nitrates or nitrites, the amonia between 0 and .25, all stays stable. Temp in the tank is between 78-79. I have about 12 peacocks, 3 yellow labs, and 3 clown loaches ( which are doing very well and seem happy) and a couple of pleco bushy nose. We have a 405 fluval filter, sponges get rinsed out in the tank water,replaced every couple months. Carbon, same thing as with the sponges. I have two other tanks, a 55g and 30g, that are on the same maintainence schedule and they are both beautifully clear, just not sure what Im doing different with this one!! All the water test within the safe zones. How often do you reccommend taking the rocks out and doing a good vacume under the rocks? Any suggestions will be very appreciated, so thanks in advance for the support and advise!!