Spider mites for sure. THose motherfuckers.. I can rant for days about those sons a bitches. If there is one thing I've learned -- FUCK MITES. SPRAY SPRAY SPRAY and SPRAY MORE. At this point I would highly suggest "Mighty Wash" .. will not eradicate your mites but it will definitely keep them...
Water temps above 75 is horrible. Your oxygen levels plummet, even with airstones. I would have to say the epsom salts are now your worst enemy. Flush with 5.8 ph water for a day or two. GIve that girl some Revive. SHell be ok.
-Grish
FFOF has nutes to last you 3+ weeks. Let your soil dry out a bit more before watering again. PH around 6.8. I recently fired my outdoor greenhouse up after years of it sitting dormant. Been in love with my ebb and grow bucket system with some amazing results. SOil growers who have never done...
I would definitely replace youre cal and mag if youre using RO. That mag def picture looked awesome. The pic of the shit plant next to the awesome one.. your awesome plant looked like it was a bit overwatered. Flush.. let your soil dry out a bit more between feedings.. and go with some calmag...
Soil. I see a nute ball in that stuff. Poor girl is getting cooked by nutes. Best you can do is go dig up some soil in your backyard or buy some foxfarm. No more Wal-mart or home depot soil. Start over.
-Grish
What PPMs? Hydro or Soil?
I see a bit of canoeing on your other leaves. Pobbible your light is too close? Although it looks like youre using LED's or something.
-Grish
NEVER EVER EVER flip a plant from veg to to flower then back to veg. Shes freakin out man!!! Doesn't know what the F to do! SOunds to me like youre over ferting the crap out of her. Drop your EC a bit and give her some Revive. Shit works wonders... also a vitamin B supplement will not hurt as...
Small leaves could be a good thing.. Plants will make bigger leaves if they feel the need. Could be strain... what PPMs you feeding them? Like ringsixty said.. Pics man. Post pics!
-Grish