Mine ate right away frozen.. They liked blood worms. Then one week they thought they would only eat live. So the next week the starved and i pulled the excees food out.. After that they returned to eating frozen No problem.
We have a local that has a huge fish house in his back yard and he raises Chinese brine. They love it. Also we go collect from the Great Salt Lake this time of year.. It's easy to get 10 to 20 lbs of brine in about 10 minutes.. And mine love most all brine..