Sorry for been a little slow in response

Yeah i suppose you could call them hooks in a way.

this is about as clear as i can make it with my pictures. Basically it is just a very simple bent piece of wire.









all you have to do is twist the wire one way to lock it behind the glass lip. Your outside of the tank control motion is the red arrow and text. The blue arrow is the effect in the tank.



As for the cleaner fish we already have a working cold water aquarium so if the fish don't work out they can be Transferred else where. The Frog probably won't care tho Tree frogs seem to not be bothered by a lot!