I would suggest a false bottom under that for collecting the water. Eggcrate or a hydroball bottom would be fine but I think I would go eggcrate and have a pump down below to circulate and filter the water. Then your substrate and plants above that. The water feature is looking so awesome.


Here is a simple eggcrate false bottom: http://www.frogforum.net/vivarium-te...se-bottom.html