Okay, so the ammonia has been .50-.25 all day. At last testing before a water change it was .25. Nitrite has been 0-.25 ppm. .25 ppm at last testing before water change. Yet nearly all the angelfish, along with one gourami have been lurking in the top corners of the tank. They seem to have no labored breathing, not gasping for air, and their gills are not moving any more rapidly then those of the fish nearer the. bottom (still active though). Is my test kit incorrect and the ammonia is higher? Or could this be from the salinity, temperature? I have three air stones going, and I took some of the water from the tank to increase surface agitation from the filters. I lowered the temperature slightly for a period of time to see if this had any effect, and they continued to hover there. I would almost think they were waiting to be fed, but since I'm new to fish I'm not sure how much I should worry and if this could be accurate.