I myself have 9 cinder blocks stacked 3 high each holding up my 55 gallon reef tank. it's not very pretty but my wife bought some material with saltwater fish pictures on it and wrapped it around like a skirt around the cinder blocks under the tank. now, the cinder blocks I'm not an ugly site any longer.
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55g Reef Setup: 2 Percula Clownfish,5 Blue Legged Hermit Crabs,1 small Kenya Tree Coral,1 Toadstool,2 Yellow Sponge, and 1 Firefish.