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i was also thinking hydroids but wasnt sure. they are only in my refugium so should i worry about wiping them out as soon as possible or see if they spread?

Can anyone tell me what this is?. they are growing on the inside of my refugium.They look like they are all connected by a thin line. They are about 1/32-1/16 inch. Are they good or bad? They seem to be growing larger and in population. I also have this small 1/2 inch hitchhiker (clam??) Can...