Wondering why I’m having a hard time keeping one of my tanks clean. I have a 40 breeder with a 3” flowerhorn a 5” oscar and a 2” lemon Oscar I have a marineland 350 biowheel filter. I do 40% water changes 3 times a week. Only thing I can think of isn’t bacteria blooms. Water turns a yellow/ orange color. I have a piece of driftwood in there I boiled it and soaked it for 2 weeks and the tannins seemed to disappear just looking for solutions