I have a 125 gal tank,right now i am housing a 7'' RTC,a 12" Lima cat,12" Asian upside down cat,and a few smaller Irr.sharks,at 1 time i also had a 14"G.Gourami.The Gourami is gone now,i do a lot of partial water changes(30 %) but after a day or two the water gets tinted again,what could be causing this??My ph is at 7 and every other perimeter is perfect,the tank is not in direct sun light,when i bought the tank it had 2 different light bulbs 1 is normal light while the other 1 is a purpleish hue,could this be causing the cloudy water??Any help or advise is apprteciated!!!

