Sorry if I'm being really dumb here, but from what I can tell on the photos the wooden door actually hooks onto the glass ledges inside the tank?

Adding a couple of cleaner fish to the bottom sounds like a really good plan, would the frog ever go into the water and actually be bothered by the fish (or vice versa)?

Any more questions and I'll PM you, I don't want to take over the whole thread with my innane questions! Thanks for the info so far.