what kind of sea star is that and which tank is it in?

the black sand is cool but over time it starts to look dirty. pieces of rock, snail shells and anything else that isn't black will stand out like a sore thumb. i had black and got tired of it so i mixed in some aragonite.

your friend really let that one go. holy slime algae!!

BTW my company rents land to ORA.......i sell algae to them.