I'm running a biocube 29 with mostly zoas, some sps (red dragon, garf, seasons greetings), lps (a few chalices) a maxima clam, and a couple fish. I'm running the stock pump, a Kessil 160, a gfo 2 little fishies reactor, and doing a 5 gallon water change once a week. I top off with distilled water. Phenomenal coral growth and the clam is happy. I'm very satisfied with the whole setup. The only filtration is the floss material.