I've had a tiger cucumber for well over a year and it has split at least once.
I like hermits I have 200 blue legs....they kick a lot of stuff up for the corals to eat.
Tangs are good grazers.
I have more snails than I can count but none that I've added. Most of them are smaller than a fingernail.
5 green emerald crabs. (bulldozers
)
1 monster 8 inch black spine urchin that was about 3 inches a few months ago when I bought it. It leaves a sparkling white path everywhere it goes.