Well I got a chance to set up a QT. I took the bag of bio-max from an AC30 filter, which has been in my 150G SW
setup for about a year now, and put it on a 20G QT tank with an AC30 filter. I added ammonia until it read 2 ppm
and I've tested every day since then. That was a week ago. I've seen no decline in the ammonia reading and no change in nitrite or nitrate. Even when I was fishless cycling my 150G setup over a year ago with no biological "seeding" material I was making quick work of 2 ppm
of ammonia after a week.
It's pretty clear that something isn't right here. I've never had any problems with AC
filter media. My 150G setup is fine. It supports 19 fish, including 5 damsels and a tang, with no problems. I'm wondering what the next logical step is here to get my QT going. Should I take a piece of LR
from my 150G setup (that's what I'm using as biological filtration) to try and seed the QT?