Don't know if this is the right place for this question, but for about 2 weeks my water has started to look murky, i do a 50% water change an it looks good for about 3-4 days than back to the same murky water. I have a 90 gallon with (2) aqua clear 110's cycling about 1000 gph is it time for some new filter media its been about a month an i just rinsed the sponges out on the last water change. I have 3 oscars an a Jack demp all about 3-5 inches an of course a pleco.