how about weight??

A 75 gallon can weigh 850 pounds or better once it is loaded. Yes, that much weight can cause some floor problems.
 
75g's can cause trouble, but usually don't, you are looking at about 750(Give or take depending on decor, substrate etc.) pounds spread over 864 sqare inches, so unless you have it in a really bad spot you should be fine. I weigh 440 pounds and my Brother weighs 360, and we can stand next to each other almost anywhere without falling through the floor. I would make sure you have the stand supported evenly and very level, as weak floors are known to sag a bit, and twist a tank which will eventually lead to unzipping of seams. It is always wise to take a good look at the structure below a proposed tank spot, and also to situate the stand so it's perpundicular to the joists not parallel.
dave
 
We haven' actually tried that particular activity, but it's ever present in our minds when we are together. The bad part is that neither of us are really that obese (we aren't exactly lean any more, but my chest still measures 20" bigger than my waist) , so we can stand fairly close to each other. the potential for dissaster does exist. Even when I was younger things tended to break under me. I played college basketball at an extremely fit 310 pounds. So 440 puts me in the same shape as most middle aged beer bellied folks. not at all the visual that that number should normally produce.
dave
 
Deveedka , you and your brother dont stand in one place" day in day out".I,m talking about dead weight here .My friend lives in the same complex as I do and has a 55g and there is no sing of trouble yet. can there be some long term damage? I,m a renter and I dont want a tragedy.Althought it would be spectacular to see a tank crash trougt a floor ,the damage outweight the entertainement factor.I dont wish it to anybody or to anyone to fall trought a floor ha ha .
 
Agreed, sorry to get off on a tangent.

we are talking about something in the range of only 1-2 pounds per square inch if set up properly. spread out across the floor joists especially near a wall should not be an issue. Most folks who are worried about the floors keep things 55g and below, but a 75g isn't IMO a very risky tank as far as floor weight. In real load bearing terms the stress that I put on a floor in squre inch weight is far and above what a tank will. Support structures also tend to do better with non moving weight than with motion and shock. I have not seen many floors that would scare me with a 75g tank. When you start getting into taller tanks, with more weight per square inch, or tanks large enough to really create a huge load across a limited number of joists then it get quite a bit scarier. In any case a little attention to the structure and how the tank is positioned is the key.
dave
 
i have a 90g and a 25 cubic ' fridge.the tank is spread out.the fridge has half the footprint and almost the same weight.or take a waterbed. mine only has 5 feet on it that are only about 2" across.
anything under about 150 would probably be ok if across the joists or over a wall.
when i was framing houses we would lift full skids of plywood up and drop them in rooms with no wall under it.and never had a problem.most newer houses have 3/4 plywood which now must be glued to the joists.that little bit of glue really adds to the strength.in an apartment with concrete floors you should be even safer.an older house i might be a little worried unless you have a wall under, or are able to build some.i've had to repair a couple where the bathtub fell to the basement due to water damage and rot.or plumbers that cut floor joists.
gl
mark
 
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