Check out Garf link. The biggest problem to overcome in the water pressure pushing out on the tank walls. Garf has all the calculators you'll need as well a making up a materials list. Good luck, I've been debating whether or not to try the same thing at "sometime" in the future.
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110 gallon acrylic with compact flourescent/actinic
55 gallon for sump/fuge
about 40 lbs of live rock (more to come)
ssb in tank, dsb in fuge |