My refugium is a 15 gal. tank under the 28 gal. display. I have a 'Lifereef' overflow and a mag 5 for the return. My lights are PC with one 50/50 bulb (though you can probably get away with less light) and I've got about 5 or 6 different types of macro in there. I like the caulerpa because it grows fast and I harvest about 3 cups of the stuff every two weeks.
Geoff is right, if possible, a fuge above the tank would probably keep the larger critters alive because they don't get chewed up in the impeller of the pump.
HTH
Interesting side note Geoff - I put a firefish in the fuge to keep another firefish that had found it's way down there a couple of months before, company. Within 2 hours, the poor thing had found a half-inch gap between the glass and the intake of the pump and got sucked into the pump. The reason I know this is that when I checked for the new fish, I happened to look up into the display and saw the
fire shrimp munching away on what was left of the fish - the shrimp had a minimum of 1 1/4 inches of the tail end of the firefish clamped in his little claws. The pump obviously killed the fish, but that chunk was quite large and got through in one piece. Weird. Needless to say, the original firefish is now in the main tank since I was able to catch him when I tore down the tanks a few months ago for the move.
