Do the reproduce sexually, or by division?A mini brittle starfish.
You can eventually have a tank full of teeny tiny floating arms when you feed the fish. But that would take , guessing, at least 5 years of overfeeding.
I know I've added at least 10 minis to the tank in the past 2 years and i still don't get to see them in all the rock we have.
They are too cute.
