Thanks again all. No change yet, but I at least now know they should improve with time. I change water so often because I plan to have Discus soon and just want to have it be a habit before I start. I figure if I'm going to change one I may as well change all. I have 5 tanks, 75g (soon to be a Discus tank), 55g Ciclid tank, 45g sevurum tank, 12 shrimp & Tetra tank, 5g Beta tank. The Oscars are not acting skitish or any thing like that. Water changes doesn't seem to stress them out.