breeder tank rafting beds

[ods]

Im setting up my 55 gallon breeding tank. i want to keep the water separate from the other systems. can i use rafting beds solely instead of media beds? My over all plan is to have a breeding system, a fry system(Media based), and a growing system( media based, and rafting beds). incase i have a problem i wont wipe out my food supply.

[George]

Filtered water is recommended for rafts.