I was not planning to comment further on this rather minor thread, but I somewhat feel obligated to, based on the comments above.
Source: This suggestion came from Claude during one of his many walkthrough videos of the Interzoo, all in German, unfortunately. There are a number of folks who are currently trying this out, including folks who are in the hobby for decades. Therefore, this was not meant to be a delayed April Fools joke - unless myself and many others missed it. Link to the video here; you might be able to use the English dubbed version, but it is only a few seconds he mentions this (22:55):
Alex' rant - read with caution: I must say I am somewhat surprised to read some of the comments. We are dumping gallons of antibiotics in the tank for the most minuscule issues - something that only happens in our country - and then feel all of a sudden concerned when someone recommends feeding
FISH flake food to potentially be able to eradicate/or significantly reduce one of the most annoying reef pests. Calling this silly speaks for the ignorance we often have to new ways of reefing, where I feel most innovation comes out of Europe, and we often rely on what was done decades ago and/or what someone who claims to be a reef chemistry guru blesses (and who never pulled off a good-looking tank). Rant over.
Why I shared the information: I simply shared this information because I know many have this problem, and it is not an easy fix. I am currently in a similar situation with flatworms, and I would similarly appreciate if someone would share experimental information as I would probably give it a try after careful risk assessment.
What I would do: While it sounds like a fix that is too easy, there are downsides (if I find more potential issues with this, I will share them). First, phosphates will probably go up significantly, so running GFO would probably be advisable during the 4 weeks of 'treatment'. This, however, will then mess with traces and might impact coral health. Second, I do not know if it is advisable to do this if other anemones are kept in the tank - or even NPS (tbc). I can find out if this is of interest to some, but my natural inclination is that it could cause harm. In summary, not a slam dunk, not sure if it works - this thread started with the word ‘apparently', but potentially worth the 'risk' trying it out in some circumstances.