I have that Identical stand! Actually matching 29 and 90 gallon stand/ canopy combos and I love them. No joke I've had them since the late 1990's and they aren't going anywhere. They are by Marineland but I forgot what that exact series was called. As stated above, what has separated is not structural so you're all good. The stand is assembled by Cam Locks so since it's second hand I would go around and make sure they are all tight. If you're not familiar with cam locks they use a phillips head screwdriver and lock a post from the adjacent piece they're closest to, so you give a quarter turn clockwise and see that it's snug, that's all. Not to be a downer but they aren't solid wood. It's a veneer over MDF (or similar). I found out when I drilled into it for light hangers. That being said I've had an open top 20 gallon sump under my 90 for 20 years and have zero signs of moisture damage. It's nice furniture, just not solid wood but I wouldn't have known without drilling it. $50 is a steal for that! Did the canopy come with the tinted glass tops? or just open rectangles up there?
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