I've asked this on the Drs. Foster and Smith website; both the live chat lady, and also called them and spoke to a customer service representative as well, and they both said it was okay. However, I have serious doubts about customer service reps understanding fully how the stands support aquariums.
Basically, I purchased the mixed media 20 high cabinet storage stand from Drs. Foster and Smith website, for my 15 gallon extra high aquarium. My apartment only allows up to 10 gallon aquariums, so I figured the 15 gallon high with the same foot print, but just 6" taller than a 10 gallon, was the perfect solution. (I had two 10's on a double stand before, and the apartment maintenance man didn't blink an eye. I don't think they care really. We have been here 4 years, I'm not worried).
Anyways, I'm concerned now that since the 15 gallon aquarium won't have it's perimeter lined up with the support beams on the stand, that it won't be able to support it's weight. The lady told me I can just put it in the center of the stand, and it'd be fine. I just wanted to check with some people here, to make sure that it is indeed okay. It will be filled with about 40lbs flourite, driftwood, rocks, and water of course.
It arrives tomorrow, so I was hoping to get my tank set up.
Also, should I put some foam between the aquarium and the stand?