Weight of a tank and how not to flood your neighbor

[BCReefer]

I am looking into a 50 – 77 gallon tan. Could anyone please tell me what the avg weight would be if I include rocks and a sump system. I am guessing at 1100 lbs including the stand for a 77 G. I live in an apartment with Truss Joist floor system. I have been told by an Engineer that I should have no problems.

2nd – I would like to ensure that I don’t flood out my neighbor below me. Any hints on what to do to ensure that this does not happen. I am think of putting the Skimmer in the sump. I will be taking my time to do this right so any pitfalls that my fellow reefers have done I hope to not replicate with your help..
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