Yes, that's a good suggestion from Kevin. I recently brought home a new little guy after my Kibbits passed away and left his mate (Igby) alone. The advice I've received is to wait until the new guy is more than half the size of the larger frog to avoid any unfortunate meal tempting. That is, of course, after the normal 30 day quarantine period.

Luckily, given his age and how fast he is growing, Quibble (the new frog) will probably only have to wait the minimum 30 days before being introduced to his permanent tank with Igby.