Quote Originally Posted by MootWorm View Post
Pet/reptile shops usually sell universal clips. The best kind for a tank IMO are the ones that actually slide onto a track that's on the tank itself, and then lock with a pin. But that is part of the tank, I'm not sure if you can modify it to fit a standard fish tank. I can post a pic if that's unclear.
I've used the standard universal clips and the Zilla locking clips, both of which slide into the track at the top of the aquarium on a standard fish tank just as well as they do on Zilla brand terrariums. As long as there is a rubber piece running along the top (which pretty much all fish tanks have) you should be able to use standard clips that reply on sliding underneath it. I've never seen an aquarium where that rubber around the top was glued down so well that you could not slide a clip underneath it. From the little hole on the lid (the one meant to be there on the edge, not the tear), I am guessing that's a Zilla top. Those little holes are prescrewed to fit these locking clamps:

http://www.amazon.com/Zilla-09732-Lo...a+locking+clip

They work great for me and, like the universal ones, depend on being able to slide up under the little edging around the aquarium. If I were you I would go with those, simply because they give a good fit and you don't have to fumble around with bricks (which I tend to drop on my feet) LOL.