Paglaum22
Aquarium Advice Regular
I found a yellow, small caterpillar like organism on the back of my tank I believed to be nudibranch. Are they good or bad to the reef?
Depends. Most of them aren't very reef safe, but if you don't have coral or sponges it won't be an issue and will just die.
Well take it out. Never know where the little buggers can come out of.
I don't know that I would kill it before I knew what it ate. I would want to observe it and see what it does.