Yeah it happens when it happens. I have a qt tank but stopped qting fish about 2 months bc I had bad luck so I was lazy and just let it sit. I also put some cheato in there because I needed room in the refuge. Now it's crawling with copepods and other little worms and stuff. I also noticed a new red macro growing do y'all know what it is? Oh and I haven't done a water change 2 months.But it gets introduced naturally like on frag plugs or snails.
I always thought the bottled stuff was snake oil lol