The way i see it is when you raise po4 or no3 bacteria that can compete or directly consume dinos can grow. So why dose bacteria its likely there just not fed enough.
If you want to introsuce bacteria, add a coral or live rock. Plenty of it there.
I added MicroBacter7 and BioSpira and ATM Colony at different intervals during my dino battle. I can't say I noticed any differences. I did the Elegant Corals dino treatment and then installed a UV sterilizer and the tank now looks great... except fir thes constant cyano battle, but I'll deal with that over dinos any time!