Originally Posted by JackSpadesSI
The only style of stand that seems to accommodate 55-gallon aquariums (there's a bunch for bigger or smaller tanks... is 55 an oddball size?) is the Classic Pine series.
From the picture, that one looks way too thin in the depth direction to fit a larger canister filter. Heck, it looks like that stand runs the risk of being top-heavy and tipping over!
The stands are sized for the 55s they sell. Most 55s made by most aquarium companies are 12x48 and the stands are 12 or 14 inches wide depending on style. 55s in those dimensions are one of the most common tanks sold.
The inside of the cabinet will easily fit any appropriate sized canister made or even two for that sized tank and will also hold all your supplies.
I've owned them for years, no issues. If you manage to tip over a 55 on it's stand, then you're doing something wrong.
Good luck in your search for a really deep 55 stand. You'll probably have to make one.