
Donkey Dung Sea Cuke (Holothuria mexicana) Range: Tropical West Atlantic. Size: To 20 inches. This guy is 3 years in my tank about 15 inch long. it was 6 inch when I got it.
He cost me $30. We have a dealer here in the DC area that gets a lot of weird critters. (big place with about 60,000 gallons of tanks in a green house). They try to get the odd stuff that is reef friendly.
3 years ago he was about 6 inchs
He cleans the sand of waste. They are one of the best sand janitors I have ever had. It stays in the top inch of sand and eats the sand. It passes the sand thru it's system and as it comes out it is very clean. It does not dig deep and it moves so slow that all of the sand critters (that you want to keep) get out of it's way.