Your tank is 90g cube that means 28"x28x28. The joists are usually 12" away from each other. For a better support, you have to know where the joists exactly are so you could put your tank on three joists. Otherwise it will be on only two, that's not good at all. "you have to" because your tank is "heavier " for each joist than the 240g 96"x24x24.
Last edited by ongquang21; 03-29-2014 at 05:58 PM.
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