simple answer, as much as you can afford. Seriously. Skimmers seem to be the You get what you pay for thing. And good ones are quiet. I have a not so expensive one LOL. Coralife's I hear are not very good. I have a AquaC urchin. Was going for the EV120 but got a deal on this used. Its a little noisy cause its a spray style not a bubble style.
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Dan Pesonen
Umm, a tank or 5
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