I was using 2 marineland 350 power filters on this tank for 6 months with no substrate on the tank bottom for a 4" arowana
Didn't have the cloudy water at that time
2 months ago, I decided to move 4 goldfish into the 125 gallon tank and was still using the 2 Marineland 350 power filters. Water was clear so after a couple of days, I moved the other 4 into this tank. I then added the 4 large triple flow box filters to give the goldfish more circulation and have the box filters help trap the waste.
Then, the water started to get cloudy on the 2nd or 3rd day.
I did 30% water changes twice a week to cut down on the cloudiness and the green water
1 month ago, I bought 2 AC 110 power filters hoping that these stronger filters would make a difference.
I still do water changes twice a week.