I have a 29 gallon reef tank. Although my set up is not what is considered ideal, I do not have the money right now to make it that way. I make improvements as I can afford to. All of my inhabitants are very happy, so I will tell you what my set up is like and take what you will from it. I have two emporer 280 filters, approx. 35 pds live rock, approx. 30 pds coral (on bottom) and live sand (on top) - I am not sure exactly, probably 15 pds of each, no fluidized bed, one heater which maintains 78 degrees f. constantly, power compacts for lighting, one clown fish, one scooter blenny, one juvenile wrasse (which is coming out and going into my fish only tank as soon as I can catch him because he's picking at my frilly purple gorgonian), one sebae anemone, 2 candalactis (?) anemones, one pulsating zenia, one gorgonian (mentioned above), 4 turbo snails, 4 astrea snails (which I don't like and wouldn't recommend), a bunch of hermit crabs, one anemone crab, one flame scallop, some button pollups (?), one beautiful red sponge, and one tube (fan) worm. I do not own a protien skimmer. I am not advocating that you don't need one, as soon as I save up the money, that's going to be my next purchase. After hearing everyone on this website insist that it is vital, I will take their advice. But as you can see, it can be done without one. I ALWAYS do a 10 percent water change weekly however, with out fail every Thursday, with quality water that has no phosphates etc., in it. Which may be why I have gotten away with not using the protien filter. I also don't have powerheads, I think that my two emporer filters create enough water flow for my tanks inhabitants. But I am considering getting one for my red sponge, which I have been told needs high water flow. Well thats everything. So basically I have my two filters, my heater, do water changes, have live rock and live sand, and that's it.