Flushing mid flower to rebalance the soil pH ?

I'm not sure whether I'm hitting the mark the plant will start to feed on itself but it's only week 4 .

I'm wondering wether I'm looking into an eventual nutrient lockout . On one plant or wether it's just at that stage of some discoloration .

Another strain in the second pic does it look like the beginning of a phosphorus deficiency


There is a couple of black dots on the first plant wondering is this a sign of the lack of air extraction from no inline fan causing some virus or disease in the plants

They look pretty good, could probably use an extra dose of nutrients especially that bigger one with the lighter green in the center.

How damp is your soil it looks pretty dark? That could cause the coloration issues. You most likely don't need to flush at this point in my opinion but others input is certainly welcome.

Seeing some phosphorus deficiency. Are you feeding? You're right on with your diagnosis.

Little stronger feed for sure. That isn't a PH Issue but great job so far. They look hungry but not too bad.. Personally I'd pluck off those ugly leaves and up the feed a bit and see if any new signs show. I don't leave dying/unhealthy leaves on the plant.