honestly, in the short term theat male would be better off in an unheated but monitored tank placed in a room that's typically warmer than most. a few days of low-ish temperature would do a LOT less harm that a 3-way fight potentially could.
also, it's recommended that you keep females in groups of no fewer than 4, since that's the minimum number needed to develop a proper hierarchy and prevent one more dominant girl from beating up on the other.
So remember, when you're feeling very small and insecure,
How amazingly unlikely is your birth,
And pray that there's intelligent life somewhere up in space,
'Cause there's bugger-all down here on Earth.
Loki/Grendel/Gail/Beowulf/Camilla/River/Bathory/Arwen/Lafayette/Deb/Jack Skellington (soon)