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Figured it out! It's spider mites! Eeeew!!!

Canna Vega A&B and a tiny bit of Ferro Enzyme Plus. I've been keeping the nutrient solution at 1.0-1.1 E.C.

Simple question: Is this nutrient overload? And if it's not... does anyone know what it is? My pH might have been too high before (6.6), but I've taken it down to 5.5-5.7 now. But still getting the 'burnt' bits.

Here's a few pics of my cuttings. I wasn't changing the pH originally, so the water and nutes were going to the cuttings at pH 6.6, but I've just changed it, however I'm not sure if this will change my problem. I was wondering if anyone recognized it as a deficiency, perhaps zinc or iron...

So a few of my plants have these white spots. I've taken a microscope to the leaves and I can't see anything moving or with legs or anything. The spots don't wipe off either. under the microscope they look like little empty pockets. I've attached some pictures so hopefully someone knows what the...