I'm switching my fish from my 55gal into a 20gal tank. I've had it set up for about a day now everythings running good. I know you're supposed to wait before adding fish, but I have to move them into the 20gal asap. When will I be able to do so? I only have about 8-10 fish to move into it. Is there any i can add before others, like bottom dwellers or anything? PLEASE HELP!!!!!!