So, I have a newly set-up AIO 40g aquarium. Started with dry rock, bagged live sand, and one piece of cured live rock from the LFS.About a month in, I added a refugium, which included some chaeto. In about two weeks, I noticed that I had a ton of small nudibranches hanging out, squirming along the chaeto. Small, yellow-brown guys. I'll try and get a good picture later.Now, without positive identification, I have a couple of guesses that they're either softy-eating, aptasia-eating, or nudibranch-eating.The tank has no other life in it, outside of the microfauna, chaeto, and algae you get towards the end of the cycle at this moment.Should I just wait it out until they starve? Should I remove the chaeto and treat with manual/chemical removal? Should I gamble on whether or not they're helpful?It's going to be a soft coral/LPS lagoon-style aquarium.