I'm researching aquaculture - keeps getting kicked down the project list - but when I finally give it a go, I'll be certain to post here.I'm interested, though. I've looked into raising larger fish in tanks. That idea is in a lot of homesteading information sources. Frankly, I'm not interested in eating (or feeding my chickens) the species that can survive in that environment. Minnows seem likely to be different in that regard.
I think it can be done. I think very, very few people who try it manage to do it. And even fewer do so at less cost.