locking system

[dunl]

I'm thinking of something saltwater, so looking at an aquarium. And I have the tank, just trying to think of a good way to lock it down.

not sure of what class level but I'm thinking if it's elementary (or even high school) why bring in something venomous. Lot's of unique stuff out there that doesn't bite.

I'm looking for ideas, not a discussion of why you think I should choose something different.