Something new appeared.

[loren_gregory]

Several of these have popped up recently. Can anyone identify them and should I be worried?

 

[Potatohead]

Vermatid snails. Mostly harmless but can multiply quickly, I crush all the ones I find.

 

[garethwood]

they do cast nets to catch food.. ive been told they can be toxic to corals but ive only ever had 1 in my tank and its only near some shrooms that dont seem to be bothered by the net.

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[Ron Reefman]

I've had quite a few and I usually don't bother with them. If one appears near a coral or seems to be bothering a coral I'll kill it.

Some people get really bad infestation of them which can be an issue. I just get some and not enough that I mind.