Hey all I'm having an issue with one of my fish. Hes a platy. I noticed him swimming kind of weirdly. He seemed to be swimming mostly diagonally as if dragging his lower half and hed be at the top of the tank like he was eating. Now, hes been hovering at the very bottom of the tank and not swimming about. What do you think the problem is? All the other fish are very happy. I checked the levels. Ammonia is close to zero. Its never read zero from day one. I think it may have something to do with my tap water. Its always been lighter than .25 but not quite yellow. Just a super light hue of green. The nitrites are 0 and nitrates 10. I hate that hes having issues. Its only been 2 days hes been acting like this. I have a 40 gal tank, Marineland penguin bio wheel 200 filter and like 15 other fish (mollies, platies, tetras etc). What do you think?