They can get a good inch long so you won't want to crowd them. A 5g would be tight but as long as you keep the water quality up you should be fine. Water quality will be an issue since you're throwing in starfish which are being consumed... pretty messy process.
But then again who am I? I'm not claiming to be any sort of expert and I'm sure there are people out there that could give you much more reliable info than I can.
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