black mold spots on my backs of my phal leaves

[Lynnzerr]

Greetings! I'm new to the board and a 'sort of' orchid newbie. I started growing a few years back, was doing pretty well with it, then fell ill and all my plant babies were lost. I'm starting again and trying to refresh my knowledge. I'm in Central Florida, in an apartment so I grow inside for now. I've recently purchased several healthy gorgeous phals from a local grower who sells at farmers markets. They all have beautiful root systems and huge blooms. These are the first plants I've ever brought home where the buds on the stalk are continuing to open.

Two days ago when I was wiping down the leaves on all my phals, I noticed that there were small spots of what looks like black mold spores on the backs of several of the leaves on my biggest one, which is 6 individual phals in a huge pot. I just brought it home over the weekend and hadn't even watered it yet. I was wiping them down with filtered garlic infused water, which the plants all respond to really well. As soon as I realized these leaves had spores, I switched out to a new cloth on every leaf I could see spores on. I checked all my other plants and saw no signs of spores anywhere else. The big one has been kept separate from all the others.

Tonight, I see spores on the leaves of all my plants Sigh.

I just checked the bacterial and fungal diseases link at the top of this forum. I didn't see anything that resembles what I've got. These look like spores that start on food left too long in the fridge, and they wipe right off.

Any advice would be really helpful!