I have several aquariums...2 x 35 gal and 1 x 15gal. I seem to always have a high nitrate level. I do weekly water changes but as I have a water softener when I do a water change the next day the water is very cloudy. My aquarium store told me it is because the water is so soft it is killing the bacteria off which causes the cloudiness and the fish to stay at the top to help them breathe. They suggested I try Kent's Cichlid Chemistry. Do you agree (one of the tanks is a cichlid tank)? Is there an additive that I can use to keep the nitrates down so that I can cut back a bit on the water changes...I already feed them every second day. Please help.