Just a heads up incase you didn't know, these seahares will starve quickly. They will destroy their food supply so fast it's unreal. Make sure you have some Nori sheets and or macro algae when you tank looks pretty clean.
be carefull of powerheads thats how i lost mine. he got close to my koralia#2 and got stuck to the side as soon as i removed him it realeased its ink and was done for. he was good at eating algae tho. i dont know how they reproduce but about a week after it died i found a small one crawling around my tank
the original Lenard