I just finished my vivarium for my fire bellied toads. I have an area that's approximately 1' X1' with land. I have a 2.5-3'' layer of gravel, fiberglass screen, then the substrate with live moss and a small live plant from the pet store on top. I was wondering if this layer of gravel will be sufficient for drainage since the space is small and I will be adding water for the plant and moss through heavy misting. I've seen some set ups with a "sump pump" and some with absolutely nothing...not even gravel or a false bottom. Please let me know if you think this will suffice.