I'm wondering why not just put precast footings and screw jacks where the aquarium is going to be? It's not like he's going to be moving it around all the time. If the footprint of the aquarium is 2' x 8', and if it will sit perpendicular to the joists, that is 6 joists that need extra support. I'm assuming the aquarium sits on a base that is not on feet, so the weight is evenly spread out under it.
If it runs paralell to the joists, then only 2 or 3 will need extra support. Maybe do the same for the 120 gallon aquarium just to be on the safe side. The 80 gal. should be fine. Lot's of people have 80 gallon aquariums and they don't reinforce their floors.
As for access, cut a sqare hole in the floor in a closet and make a cover for it.
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Last edited by ToolGuy; 01-20-2008 at 10:03 AM.