It's interesting - Snowball recently moved in with the large female (Junebug) and her mate, and she is very obviously annoying Junebug! In my experience, Woodhouse's toads are mellow and almost sociable - they often cluster together and sit on top of each other. However, they are also creatures of habbit - they seem to have specific spots they like and go about their daily routines with a fair degree of consistency. Snowball has been "horning in" on Junebug's preferred spot, and she is too small for Junebug to shove out of the way (like she does with her mate). On a number of occasions, I have seen Junebug scrabbling around trying to evict Snowball from her corner of the tank! Hopefully, they'll sort this out without too much stress!