a twenty u prob want about 70-100 watts of light.elements like calc,iodine,stronium etc,a emperor 280 would be nice and a prism skimmer or no skimmer at all depending on the stocking levels and pounds of live rock and depth of the dsb.o and test kits i used red sea sea lab and reef lab.get a clean up crew like for u 5-10 hermits,5-10 snails,1 fighting conch,1 peppermint shrimp and a cleaner shrimp or camelback.remember to do research on all fish before u buy them