Hey! Nice to see a fellow Malaysian! Okay, here's what I did, instead of using cardboard or a clear divider, u can pick up corrugated plastic (coroplast) from a bookstore (I know Popular usually has that in stock) and cut to fit your terrarium. Cheap and easy fix. Just make sure it's held securely with either silicon or cable ties. Should cost u less than RM20 to settle. Oh and on why he wants to go over? Pacmans are cannibalistic - froggy one wants to eat froggy two I think! Never keep multiple ones unseparated in the same tank!