I purchased a new stand from Petsmart that was rated to hold up to an 80 gallon tank or 800 lbs. The base of the stand was a perfect match for my tank (48 x 18 inches), however I didn't realize that my tank was slightly higher than the specified measurements on the box. Consequently, it appears as if I have a 90 gallon aquarium. My question is, do manufacturers tend to "under estimate" these maximum weight restrictions ... or is there a little room to work with? Do you think that an additional 10 gallons is significant???? Any advice would be greatly appreciated!