Pellets are a fine food for axolots and many research colonies are maintained only on the pellets. Just make sure that you clean up any uneaten food items.
If you are going away, I would suggest feeding it well the week before and then not feeding it while you are gone. Just have someone make sure that the water level doesn't drop too much or the temperatures get too high.
Ed
(Message edited by Ed on December 08, 2006)