hello all new viv questions

[cinikal]

hello all,
I'm new to this forum but have been reading it for a while to try to prepare my self for a new endeavor...A vivarium! I'm sure its been asked and answered but i cant seem to find the answer. i want to build a rainforest type vivarium to house a pair of poison darts. i have started with a 70 gallon tank and have started with a false bottom. i also have already started making some foam and non-sanded grout structures. This is where i get lost. After i have put on several layers of grout to the structures. do i need to seal it? these structures are going to be water features. if so, what do i use to seal it? or can water just flow over the grout without sealant.

Also will I want/need a misting system or a rain system or both.

Again im sorry if this is posted somewhere else.

Thank you so much in advance and hope to be sharing my project with you guys and girls soon!