the tank itself is about 2 months but every thing in it (including the original water) is from my 55 and it hasnt had any problems in quite awhile. so i guess the stock is about 2.5 to 3 years old other than the .5 inches of live sand which is actually new. all my water comes from superstore.
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110 gallon mixed reef with 77 gallon sump/frag tank
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