So the wife's anenome suddenly decided to relocate after at least 6 months of staying in the same place. Since nothing else changed in the tank, I figured something was bothering it, so the investigation started. Took about 15 seconds to find the problem after the lights had been off for 30 mins. There's a massive bristleworm and a bunch of smaller ones lurking around where the anenome was previously located. Took about 5 minutes to build the trap (most of the time trying to locate the straws in the pantry) and another 5 mins getting it in the tank. Checked it after 10 mins and there's already some activity! Can wait to see what I have caught in the morning! Unfortunately, while I was spying on the tank in the dark, I noticed an aptasia that will have to be dealt with as well!