I would avoid commercially produced organic feeds. They are going to cost more than the fish are worth, and they won't be any healthier. If you get serious, you can produce your own feed and certify how you make it. Organic certification doesn't mean what you'd think it means.

Here is an example,
Raise pigs loaded with hormones and foraging on plants loaded with pesticides. Take their manure to fertilize a pond that you are growing tilapia in. You can certify the fish as organically grown.

Take spent grain from a micro-brewery operation that uses food grade barley. Feed them to your tilapia. NOT organically certifiable.

Which fish would you rather eat?

I say document how you take care of your fish and what you feed them. People who really care about what they eat can understand that and make up their own mind.