Hello all, I have a school of 5 pygmy corydoras and I want to up their numbers. At the pet store today, they only had one pygmy corydora, so I brought the one home. I acclimated it by matching the water temps, then pouring the new fish and it's water into a bowl and adding a cup of water every 15 min untill the water volume was tripled. I then moved the new fish to my tank. It looked healthy to me, and not stressed. But it's just treading water in the middle of the tank, exploring up and down a bit, but goes back to mid level. The other corydoras are all swimming around by the sand. Is the new guy just getting used to the new tank? Thanks in advanced!