I did a complete water change before I put my new fish in the tank. The temperature is set at 78 degrees and I used Seachem Prime for the removal of chlorine and ammonia. It's supposed to detoxify nitrates and nitrites too. I acclimated the fish by keeping them in their bag but I opened the bag and hung it on the side of the tank in the water for about 30 to 40 minutes. Then I released the fish into my tank. They seem to be doing a bit better today but there's one that's still acting strange to me. He's eating ok and he's swimming but it looks like he's still "shaking." My tank has been up and running for at least 3 months. It actually was already cycled when I got it. I haven't checked the PH level's but I am going to check that today to make sure that's balanced enough. Anyway, thanks for the help guys.