Re: Is there somthing to culture house fly larvea in besides rotten food?

I suggest that you try rearing fruit flies instead of houseflies as food for your tropical fish. Kits including artifical rearing media are readily available for fruit flies. The sites listed below offer both culturing materials (bottles, stoppers, etc.) as well as live flies. Carolina Biological Supply even has a strain of of flightless fruit flies. Carolina Biological Supply also sells kits to rear mealworm larvae (they are actually beetles)which are also great food for fish.

www.edsflymeatinc.com
Drosophila

This address is for Carolina Biological Supply. Go to their site and search the online catalog for flightless fruit flies.