A little suggestion, remove uneaten cricket because if they are very hungry they can become very dangerous to the bombinae(even if the cricket are very very little). A bombina of my friend got one eyes "destroyed" by an hungry little cricket. Anyway the Terrarium should be mostly water with only a little portion of heart. Just a bowl isn't enough. If you give to them just a bowl of water they will live shorter, not reproduce and be less active and be much more stressed. Sorry for my bad english.