Unless you have 1-2 small fish in a 100+ gallon tank, your tank won't be able to support enough pods to feed your fish naturally. You're probably going to have to: 1. feed your fish 2. feed your pods (to sustain a large population) 3. keep adding pods (essentially feeding your fish live food).
_________________ grape ape plants
I agree with brian- it is probably not feasible unless you have a very large system and very few top tier consumers to rely on the tank pods for food. My last tank was designed around a mandarin, with a similar idea in mind- of providing only live foods. I had a 20 gallon fuge above the tank, draining by gravity, which had 12 peppermint shrimp fed heavily, so they laid eggs about every 2 weeks. I had a huge pod population, and tons of small peppermint shrimp. The mandarin was the only pod predator in the 37g tank, and I still had to feed it...