I have 3 weather loaches and I think one might be getting sick. He has pink splotches on him that just showed up today. I clean their tank last night. They were fine before that. The has not cleared up yet. The PH was very high so I treated it with PH Down.The nitrates are very low. At first I thought the spots might be bruises from swimming into some of the stuff in the tank. There is nothing shim sharp in the tank but they swim into everything, the glass head first all the time. If they get startled the dart around to hide and they swim against and into the decorations in the tank. I just lost my first dojo and I might be a little paranoid right now. What do you think it might be.