Fish Food BuildUp?

So I have a lot of fish food that has built up on my gravel because I used it for cycling my tank. I have done about 4 gravel vacs and there is still a good amount left. I am also developing biofilm because of the protein released from the food. I have a few questions. How often should I gravel vac? ( I have... show more So I have a lot of fish food that has built up on my gravel because I used it for cycling my tank. I have done about 4 gravel vacs and there is still a good amount left. I am also developing biofilm because of the protein released from the food. I have a few questions.

How often should I gravel vac? ( I have been doing it everday)

Is the food going to release any kinds of fungus and disease that will destroy my water?
Update: Also, should I throw a bottom feeder in my new tank so it just gets rid of the food for me?
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