Why has my established fish tank gone cloudy?

T

*=/\=*Ta1nO~(-:-)~

Guest
Well my 100 gallon fish tank has been established for 1 year. For about a month the water has been cloudy. The ammonia, nitrate and nitrite levels are low (0 ppm). I do a weekly ( bi weekly when i get lazy), 20% water change. The fish shows no sign of stress. I have a black, bala, and a red tail shark. Rafael, lace, and a pitcus cat fish, clown loach, gold gourami, 2 angels, silver dollar, tin foil barb,clown pleco, Hifin spoted pleco. I dont use any chemicals in the tank except stress coat when i do water changes. My ph is lower than normal (6.0). I dont know if that can cause the cloudiness. I dont want to change all the tank water the fish are gettin huge, would hate to lose one . The black shark is 10 inches its the biggest. By the way all the fish besides the hi fin pleco are 1yrs old. rafael cat is 4yrs old. Any recomendation would be gratefull.

~P3Ac3 OuT~
 
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