What are these?

Does anyone know what these little white snail looking things are?

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They are not snails, i usually see them under the rocks

Sycon Sponges, commonly referred to as Pineapple or Q-Tip.

http://www.reefkeeping.com/issues/2005-07/rs/

Thanks. That’s them. So there not bad. Jus ugly lol. At least there in the sump none in the dt yet.

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Yes, harmless filter feeders, their population will ebb and flow with the level of nutrients in your system.

They are pineapple sponges