culture

as the title says I have a 2.5-gallon tank. one of those cheap bowfront 2.5 betta tanks, and I was wondering what I can culture because I am hoping to breed angel fish by feeding them live foods.

First off has anyone ever done a mosquito culture before? Any tips???   Secondly, I've been trying for about 2 weeks now. Mom said that she thinks the water was too clean (it is just a critter keeper with declorinated water in it) so about two days ago I put an algae covered rock in there to...