I'm concerned about one of my dward gourami in my tank. He's up at the surface and is just hanging out there. I dont know if he's stressed or what but he won't swim around. I checked the water and ammonia and nitrite are at 0 while nitrate is at 20ppm. hardness is at 50 ppm and pH is above 8 (just how the water is here) The other fishes are fine and I just fed them right now and they are eating. I can't isoloate the gourami since the only other tank i have is filled with paper and leaks with water. I can't figure out what it is...any ideas