I am trying to make plans for my mantella vivairum upgrade. At the moment they are in a 10gal viv. I have two hexagon tanks that i could use. One is a 30gal the other is a 20 gal. The 30 gal i was going to utilize some of the upper areas for climbing. But im not 100% that they will actually use this space, so will they climb up walls and branches if they have them to use? If not i have other animals that i could put in this tank instead. Any input would be aewsome!!!