If you're talking to me, I already said I don't have the slime and never have. I have no reason to suspect that Hygrozyme will cause a problem in my setup, but since it has been discussed in here directly and several people have shared their experience it seemed like a good place to ask.
I'm asking if I could pull water from my reservoir, mix Hygrozyme, run a pump and airstone, and wait to see if it causes adverse problems that are described in this thread. If hygrozyme will be a catalyst for the outbreak it should occur regardless of whether it is being used at that time to feed a plant, correct?
So you want to experiment? It's worth a shot and not hard to do. The real measure would be to put a plant in there since the slime attaches to the roots first. If you really want to piss the slime off just add a dash of carbs along with the Hygrozyme! Let us know the results if you do it.
Your second question Im not sure of the answer because Im not clear on your question. Can you rephrase?
eta: Wait I think I get it. You have never had a slime issue but you're thinking about adding Hygrozyme to your res and want to see if the slime shows up after adding the Hygro. Right? I don't think it will. I have triggered the slime without using Hygrozyme just by having organic matter in the water (root bits from transplanting) before inoculating the roots. Slime showed up fast just from the organics alone. If you haven't had the slime by now then you probably won't with Hygro. The slime usually shows up very fast in my fresh res mixes. Are you running 100% chemical nutes? If so, the Hygro might trigger it but I honestly doubt it.