Ok, so I am planning to use one of two filters for my frog/newt/salamander tank (going in my 28g bowfront) when I start it (might start today, and work on it while this concrete takes forever on my anole tank, lol...). Both are HOB filters. I will either use a Topfin 30 or an aquatech 30-60. I'm leaning towards the aquatech because it has two baskets and two outputs, so I can do a waterfall system AND a drip wall (for moss.

). My problem is frog proofing it!
I was thinking about foaming the filter in place with GS, maybe covering the outputs in screen or filter foam so they can't get inside the filter.
I've been thinking about doing a strip of screen in the back (for lack of a better place to put it, since I can't do it in the front), and I DO have some of that plastic strip that attaches to the back of the versa top, but I'm not sure how I need to do the gap between the filter and the glass top while still being able to access the filter baskets.
My waterfall system will be something like this (please click the picture to go to the thread that this picture came from, this person amazed me with this sketch):
The pools in the middle there are what have really inspired me. Mine will be attached to glass on the right side of the tank. The one on top will also be attached to the back wall to be filled by the filter, and will then pour into the second one that will be closer to the front glass. The second pool will then pour into the open water area.
SO, I need ideas on making the filter area escape proof while still allowing the filter to run properly and pour into the pool (the output of the filter on the left side will just run down the back wall), while still being able to access the filter baskets to clean the media.
help! lol.. No rush (yes, rush, lol...).
If you guys need pics to properly visualize what I'm asking, just say so and I'll set up a little photo shoot.