hey everyone, ive had my tank for about a month now. i currently have a penguin 350 filter, with a Hydor Koralia 2 PH. is a protein skimmer a must or can i wait a bit? i plan on a aqua-c remora but shopping around a bit. about 20 lbs live rock, 3 clowns, 3 banggai cardinals, 6 astriea...