lol Yes, frozen brine or frozen mysis. Mysis is better. Try to get it in individual cubes(easier as it is seperated) Thaw out one cube in some ro/di or tap water, you can then use a (new, clean) turkey baster or a syringe to feed. Just give a little squirt at first and wait to see if any tentacles come out. If they do, then squirt some more. Feed all heads.
Alternately, you could watch after lghts out to see if tentacles come out. If so, you could try pellets or flake or whatever you have!