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 with a 65 g tank you should be fine.  How old is the house?  The I-joists used in newer homes would have no probs with the weight. 
				__________________RSM 250. Clownfish,  Fox face, Blue tang, Yellow tang, Kole tang, Clown tang, Coral beauty angel, French Angel, splendid dottyback. CUC, softies, lps, sps.
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