This wouldn't be such a big deal either, however I have been keeping both a Blue Striped Pipefish and a Flaming Prawn Goby for well over a year with zero direct feedings. I keep a large refugium and around 40 pounds of LR in my 20g system, I previously worked at a reef shop and regularly seeded my tank from their large refugiums which was a gold mine of activity. I also have probably 1000 baby brittle stars.
So I have a pretty strong and diverse microfauna population that isn't something I'd like to give up. I would directly feed them, but both animals are very finicky eaters, I see the goby once a month, and I don't think I could meet the demands of the pipefish day-to-day. So I'm here now hoping that somebody might have had experience with this, or might have a plan of attack that can effectively kill them, anything that is an alternative to intercept really.