Hi, setting up a new/first time terrarium, 99% sure i'm going with whites tree frogs. below is a terrible paint based diagram of my idea, i'll explain it, but felt a quick pic may help also (despite being basic, would draw it but dont have a scanner) am also on planning on making it a live planted tank. the tank is 60x45x60cm

so i've got this idea of putting in a shelf into the terra, slightly slanted ledge with a stream running through the middle then becoming a waterfall. Was thinking of using a filter/pump to supply the stream, and then taking in the water from the drainage layer, would i need to keep the hydroleca away from the intake of the filter/pump ? was thinking of making a a little guard to keep the hydroleca away from the filter, almost like a gumshield. As for the waterfall was hoping to put a little pond at the bottom for the frog, realised that this was tricky, becasue after researching i dont want water from the drainage layer that far up (originally positioned the pond on the top layer of substrate) would it be better to run the filter/pump from a seperate pool which i could postion through/under my 'shelf' and to the back to supply the it ?

here's the diagram of my idea, obv didnt go into too much detail with plants, decor etc.

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