Since it looks as if you are going to be getting Tangs, make sure your ph
is high and that the water is hard. Tangs like almost liquid rock. Ideally the ph
should be between 8 and 9. Whitetiger is right about the biomax. I believe the AquaClears come with Biomax in the box (at least mine did). So, if you want to have two sponges and the biomax, that would be good.