You will have to find out which way the beams on the floor run. The more beams that your tank will go over the less each one has to support. You can also put a sheet of plywood down under your stand as to disperse more energy. If the apartment is newer then they probably use I-beams (silent floor), which hold a lot more weight, if it is an older unit then you may end up having the tank go through the floor at 200 gallons. I've got a 125ish gallon tank with a 33 gallon sump on the upper floor with no probs, but the house is newer and runs I-beams. Each I-beam should be able to take atleast 700 pounds, and I've got my tank overtop of atleast 3, and put a 3/4 inch thick sheet of plywood below the stand. I could have atleast gone up to 150g plus sump, without probs, but all that is in retrospect now.
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