I got a platy from lfs yesterday and he's looking poorly. He's resting at a 45 degree angle most of the time. He can perk up and swim level if another fish disturbs him or at feeding time, but most of the time he just rests at that wonky angle. Has anyone ever seen this? Is there a way to help him? The other fish I brought home yesterday (including another platy) are fine and the water stats are good.... amonia - 0, nitrite - 0, nitrate - 10ppm.