I'm thinking about possibly setting up a small custom cube 12x12x16 nano (it would be 10 gallons). What i'm wondering is this, with a retrofit kit of 65 watts (just about 6.5wpg) what type of corals would i be able to keep, and also would i need to an external sump for filtration or just a HOB skimmer and powerheads for circulation be okay (no skimmer?) I'd go with probably a 3 inch sand bed and 10-15lbs of rock (depending how much i could fit).
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