I am 1000% sure of the source
non QT
there are two invaders among every invader you read about online that can come from non hitchhiking vectors
green hair algae and cyano (can come in on airborn flotsam, aerosols, vectored in on skin cells and other wafts, vectored in through water changes not ran through uv, on and on)
if we are dealing with an invader that is not cyano or GHA variations or microalgae dot variations, we are dealing with a requisite hitchhiker.
Its cause was import and never nutrients, although for sure these organisms seek nutrients for sustenance in some form or another and will capitalize on what we tend to store up and leak out slowly in our tanks.
Im all for nutrient control when it comes to any organism. But it is not the cause of any invasion really, a form of import is to blame
Owing to that definitive list, debatable to many and only claimed by moi lol, any invader not cyano or gha can be beaten independent of nutrient levels by making the DNA not exist in the tank. As mentioned in Russ' thread, the reason my own tank is immune to every invader except cyano and GHA and micro algae regardless of my nutrient levels is because im through stocking 3 yrs ago. zero imports occur. Whatever is gummy to the sides of the water holding vats at my LFS change water station is what can ride into my tank, but not:
macro algae
dinos
bryozoans or cousins
brush algae
valonia
bryopsis
et al
so....that little test cup you have there. mind squirting about 10 drops of peroxide into it and lemme know what happens. no im not hinting at a full tank dosing i just want to attack the cup
B