I just bought a Top Fin brand 55 gallon aquarium stand at Petsmart. After opening the package I found it is constructed entirely of partical board. I assembled it and sat on top of it. It holds me but thats only 180 lbs. I am concerned about the top surface sagging or the uprights bowing over time. I was woundering if anyone has used this stand. I can't find any info on the net about this product. I know it was built specifically to hold a 55 gallon aquarium but it seem a bit marginal to me.