My firebelly is scared of water, and climbs glass walls like a tree frog is this normal??

I have a half and half cage, and one of my firebellies love the water and the other is scared to go into it, when he does.. he freaks out! And I am always catching him on the glass in the corners on top.. he climbs the walls all the time, gets out.. there is nothing for him to climb on and get out, he just climbs the glass like a tree frog! is this normal??