Can guppies and salamanders live together?

I caught two mud puppies and put them in the tank with the 60 or so guppies over a month ago and they're doing fine. I've had to feed the guppies a lot more to keep there number's up, mud puppies eat piles as they change to salamanders, but they've changed and don't seem to be eating as much. I put some cork board in the tank for them to sit on and made sure they could get on it, but they both seem content in the water. I also caught another sally recently on the driveway and this one won't get off the cork, so I'm going to feed him house flies and other live, small bugs off the window sill with tweezers til winter, then get some baby crickets if it's not eating guppies by then. The way I see it is: If they're not moving much, they're happy, if they're not moving at all, they're dead. eHow.com has some video's that will help too. Good luck.