Hi, I have no idea where to post this or where to look on the internet.
I have these in my tank, I've found 3 and have no idea what they are, where they have come from and if they are harmful or harmless.
The retract if I go near then, don't seem to bother anything although one is growing on my coral
Should I be concerned and if so, do you know how I get them out? And also, what are they?
Many thank
David

I have these in my tank, I've found 3 and have no idea what they are, where they have come from and if they are harmful or harmless.
The retract if I go near then, don't seem to bother anything although one is growing on my coral
Should I be concerned and if so, do you know how I get them out? And also, what are they?
Many thank
David


