They have solutions for cloudy water treatment but it's usually best to find the cause & fix it. Over feeding, new set ups, improper filtration are my guess. Is your filters, media adequate for tank size ? Clean your filtration system, feed no more than 2-3 times a day only as much as they will eat within a few min & discard any leftovers. Invest in Prime conditioner. It is the best & only water additive you'll need. Proper water changes & check water regularly.