Smallest tank that can be used to keep a few Choc Chip Stars

So I'd like to get a pair of Harlequin's for my nano, problem being of course feeding them, I could go the expensive route and buy stars weekly but I run into the possibility of them not always being in stock locally. I've been reading some people keep a few stars and chop the legs off rotating between stars so the legs eventually grow back is it feasible to do this with a 10g tank they of course would be the only occupants of the tank with sand and some LR.

They're suppose to be hardy but its possible they could eventually succumb to all the limb removals, my big sump/fuge has a fair share of small invert's living in it which I didn't want the star eating. It will come down to the shrimp though I've read some don't show interest in just the arm as well but some will readily take it. Choc Chips, Linkia's and Astrea's seem to be what almost all of them will eat, thought about trying to setup an Astrea Colony in a tank but do to their small size I don't think they'd reproduce and grow quick enough, plus I would need a source to buy a large amount of them and nobody sells them.

SubRosa said:

They also eat the common Starfish you find along jetties along the Atlantic coast.

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That is good to know, I could probably easily collect them here then. Are they tolerant of warmer waters? I can keep them at room temp with no heater but in the summer room temp water might hit mid upper 70's which is warmer then NY beaches get.