That's correct, although most of the rock was new dry rock that I bleached along with the old stuff. It's hard to believe anything could live through that kind of treatment but it wouldn't surprise me to learn that dinos could.
Did you re-use anything else at all? JUst bleaching rock/sand might not be enough, any of the equipment (tank, nets, plumbing, reactors, etc) could have a few spores which are enough to infect the brand new tank. Even fish can transfer dinos, on surface, or ingested dinos that survive. All anecdotal, but in my 2+ years of reading i've seen it all.
They know I am battling dinos. I have shown them the microscope videos previously.
I guess the link between low nutrients and Dinos is not widely known or understood. I suppose Dinos is one of those subjects that you will never truely start to understand until you have battled with it.
I am not surprised, my LFS laughed at me 2 years ago also. I would not follow their recommendation. With overfeeding, it's hard to control Phosphate level. With dosing, you can get it to .03 exactly if that's your aim, see dialy consumption - develop a daily dose.
The research you've done here is already way ahead of what LFS employees know. I talk to many "best of the best" LFS stores in NJ, most don't read forums; lost of empoyees don't even have an account on R2R or RC. Knowledge you are getitng here, they may get to it in the next 5-10 years.