It's your tank and you can do with it what you want, but the thing with the castle is that it will take up valuable space needed to get the correct amount of live rock you need for your biological filtration. Going by 1.5 lbs/gallon comes out to around 115 lbs of LR. That's a lot of rock and 1.5 lbs/gallon is a little on the light side.
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-Bill
My first tank! Future FOWLR 29 gallon All Glass with sump cycling. Waiting patiently.......... Well, trying to wait patiently!
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