Again assuming the phrase "properly built" that stand will hold almost 10x that weight.
*When you built did you use glue as well as screwing it together?
*Did you use at least 3" screws. also pre drilled helps by not weakening the wood from splitting.
*Is it level?
Pharoah did a post on the strength of wood we use for our aquarium stands.
Good luck, and pics (lots of them) would be helpful in trying to assess your work
Bear
*When you built did you use glue as well as screwing it together?
*Did you use at least 3" screws. also pre drilled helps by not weakening the wood from splitting.
*Is it level?
Pharoah did a post on the strength of wood we use for our aquarium stands.
Good luck, and pics (lots of them) would be helpful in trying to assess your work
Bear