depends on size of fish, have kept them in 4 foot plus tanks before
can sometimes be found on mount beach during and after a good onshore storm, they get stressed in wave action, puff up then are poor swimmers and get pushed to the shore
if you can get to them early enough and into a bucket of saltwater they calm down and deflate, if they aren't too damaged they last quite a while in tanks
keeping is same as other local marines but they can take bites out of other fish if hungry, can take a while to settle