Out of the corner of my eye I noticed what I thought was an anemone move in my tank. I took a closer look and watched an amphipod run into the anemone and it shot off like a jellyfish! Turns out it was a Hydroid Jellyfish. It might have came in on some chaetomorpha I got from LiveAquaria as that’s the only thing I’ve added to the tank for quite some time. Sounds like they aren’t too big of a problem in a reef tank so I wont worry too much about it.