Now what have I done? Ok, so I checked my water levels again today (its been 1 week since my cycling has been complete), and nitrates are still at 5ppm (ammonia = 0ppm, nitrites = 0ppm). So I guess it isn't time for a water change, but the tank needed some more water cause it was going down quite a bit (its been hot here lately). SO I mixed up 5L with the appropriate amount of water conditioner, aquarium salt, put a dab of cycle in the filter and added the water. I guess it was a little warm cause it raised the temp of the tank 2 degrees. Almost immediately, the fish started acting weird, my big guy is kind of swimming tilted to one side. Is he just a little warm? I turned the light off to take some of the heat away, but before I did that, I noticed his top fin had a tear in it that wasn't there before I added the water. How the heck did that happen? Should I add some more stresscoat to the water to repair his fin? Hope they'll be ok by the AM. I feel awful for them. Poor guys. I worry so much about them!