Well I've been thinking on refug but then thought about a mini sump/refug...but been I'm only aloud 20 gallons too play with, water volume is starting too be concern..how can I measure the water displacement? It's a 17.5 gallon with 40lbs rock 30 lbs sand...im woundering how much water is actually in my tank I would like too do a 10g using only half the tank if that.. So really only 4-5 gallons water in over flow tubes tank return ect I'm planning.. And what would be best drain set up herbie or what??
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