Does anyone know what this is?

[Nickcdll]

Is this a snail without a shell?

 

[James M]

stomatella snail , very good CUC

 

[Nickcdll]

stomatella snail , very good CUC

Are they good or bad?

 

[James M]

Very good clean up crew

 

[Muttley000]

When the spawn it looks like smoke coming out of your rock, free coral food!

 

[BestMomEver]

Very cool critters... they’re good to have around!

 

[AnemoneBay]

Hi Nick! This is little Andrew, that's totally normal, they are also algae eaters too, are you going to fragtober fest today!?