Vivarium question

[Tigersicord]

I have a waterfall in my 12×12×18 Vivarium and my tincs don't seem to be troubled by it, I did have to make some adjustments seeing in all it's a table top waterfall, like cover any small openings or use mesh to make sure my frogs dont accidentally get stuck where the pump is. I have to clean the filter and pump frequently cause the fruit flies like to commit suicide and get stuck.