Looks good!

Did you sand down the edges of the door on the coco hut? If not than you should do that. It will prevent the very chirp cocoanut shell from hurting your future frogs.

When the "Polka Dot" plants grow up to the top of the tank just cut them back (just above the leaves you want to stay apart of the main plant. The part you cut off can be replanted and it will easily turn into its own plant. In no time at all you can carpet your tank in it

I really do like it. You did a good job maximizing the space of the 20g tank!