Sea Cucumbers are excellent scavengers crawling through the substrate slowly but efficiently. Loved by the aquarium industry for their desire to eat algae, detritus and other foods with there hundreds of tentacles swinging through the water. Varying from 4" to 8" Sea Cucumbers can scrunch together or elongate themselves to fit in to smaller crevices or holes. Every animal has some sort of defense mechanism, Sea Cucumbers release a holothurin toxin that can harm other inhabitants. Avoid putting Sea Cucumbers with predators since that is the only time they feel the need to release the toxin.