Yeah, I saw a brs interview with the owner of WWC, and he said it was the number 1 worst pest, toss out everything but one small frag, seal up the crevices with super glue, then dip monday, wednesday, friday. I’ve been watching my montis closely, morning either before or right after lights come on, when I get home after work, and 2 hours after lights go off. Going to dip every other day minimum, up to once per day. I’m really liking this potassium chloride that will handed out at the swap. I like how safe, non irritating, but effective it is, as well as being clear. I dont know why anyone would use anything else (unless it doesnt affect their pest).If you're going to go the dipping route, which is a good one, you should be dipping every monti every couple days. There's guides online, but I think it's approximately every 3-5 days (some guides say daily, some 5 days, more is better). Scrub with a brush or at least a toothpick any white tissue spots. Repeat for ... weeks.
They don't live just on the monti, as is probably obvious given you saw them on the glass. This is why it's a bit of a nightmare to fight these guys. If you don't love your montis, the easiest path is honestly toss em while the tank is still young, but the info online says you need to wait like 6+ months with no montis to get em all.
That all sounds pretty extreme, but these things are really difficult to get rid of. They're the type of thing you get once, and afterwards you never trust any frags again.
The other alternative is if you can get some shrimp and wrasses, you can just live with them eating your montis and hope they grow fast enough that they're just annoying but not devastating.
I do want to have montis encrust my back wall, so it would suck if I have to continually deal with these, thinking instead of just straight tossing them out, I might just start up my cube as a monti quarantine tank. And you are right about not trusting any frags now lol, I do want a few more montis, but reading about how long the eggs last, plus how they arent affected by dip, its pretty scary. But having my cube set up as a monti qt would give my mind some ease. We’ll see what happens