my tank is well cycled and i want to change the fish i have in my tank now. I have an odd mixture of tetras and i want them to be more similar so i was going to take a couple back and get 7 of one kind. Do i still need to make these changes slowly or can i take back 4 fish and get 7 new ones. Im not doing this right away as im still finishing up my ich treatment so i assume i cant make any changes untill that is done thoroughly?? any advice is appreciated. i have a 10g btw. THANKS GUYS!