Going away but what about fish?

Hi All

Any info much appreciated. At christmas we are going away for about 5
days, in the past my parents have come round (2 mins round corner) to feed
the gold fish and 2 cats. But this week we have been told they wont be doing
it any more as they dont want to.

We are sorting out a cattery for the cats (hopefully) but what about our
precious fish?? What can we give them that will last about 5 days? ive seen
the fish feeder things that apparently last while you go away, or what about
putting in a couple of 'real' plants for them to munch on or some cucumber?

any help much appreciated!!

Kellie