Give the tang some time, it will likely adjust to prepared foods.
As for brine culturing - I've done a fair bit of that. I hatched artemia nauplii for baby seahorses some years ago. I couldn't bring myself to throw away and waste uneaten live
baby brine when I'd do water changes, so I put the nasty tank water in a white bucket on my back step where it got a lot of sun. The nutrients in the dirty water grew a nice crop of algae, which fed the nauplii and before long I had a self-sustaining colony of brine shrimp. No heater, no filter, no water changes - the rain topped it off or if it was dry out I'd throw some RO in there if the water level went down.
Eventually I had several buckets back there, each with a healthy population of various stages of brine. When I needed some I'd swoosh my brine net through the bucket, rinse and feed to my corals or whatnot.
I kept the culture going for about 2 1/2 years and a particularly wet spring diluted them too much and they finally crashed.
I'm in GA so the "cold season" is short - but in winter it would freeze over completely and the moment it got warm again, there'd be new brine hatching and swimming.
In that sort of culture you won't get the density like you see in a brine tank in the LFS - but you will have a self-renewing culture.
It's a bit of an eyesore, but definitely low maintenance. I would bring in a bucket or two over the winter, but they don't seem to do well indoors at all.
Jenn
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LFS Owner:
Imagine Ocean
Just keep skimming, just keep skimming, just keep skimming, skimming skimming! What do we do? We skim, skim, skim!
меня зовут Chris 
