i also wonder about this, right now i have a 65 gallon tank that i just setup the other day added my live sand, right now i only have one power head, how many should i have for a tank this size? Im also running a canaster system, with a skimmer,
i see all of people use sumps. Will i be ok without a sump?
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65 gallon saltwater tank, 60lbs live sand, 85lbs live rock, 2 ocellaris clowns, spotted goby, Flame hawkfish, scopas tang, numerous corals 
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