It's a 75 gallon tank. I do bi-weekly water changes of 25% volume. The nitrate level is HIGH. I'm thinking that I might not have enough oxygenation going on via surface agitation to help eliminate the nitrogen, so I readjusted the filter outlet for more surface movement.
I'm having an issue with cloudy water. It looks like my fish are swimming in milk. All of the water levels are good except the nitrate. It's off the charts. I have a canister filter and a mechanical filter on the tank. I used the same system last year with no problems. The fish (3) summer in a pond and winter in the tank. But this season almost from day one the water has been cloudy. The fish seem healthy and normal. Any ideas?