"The first pictures, my guess is some sort of anemone, but what do I know. It is definitely growing and it definitely prefers the dark. It was really stretched out and open in this shot right after I turned the light on. The thorny looking tentacles? are brownish, maybe even with a tinge of purple. I am curious if any knows the name, but more curious if it is detrimental - stinging for instance."
It might be Majano. If so, def take the time to deal with it asap before it gets out of hand. Some people like Majano, though. Offer some to Gabe. He loves them! ;-D
Majano Info @ Wet web media