Something going on here

Pineapple chunk auto. Temps and humidity is solid this round. Water control is good. I find her just right every day.

Mostly ro water with some of my tap water here and there.

Feeding only once a week. Never heavy. FF trio beastie at the moment. Silica, recharge and calmag.

Sitting in fresh FFOF.

Never stressed that I know, it's been a well controlled run thus far.

Not sure why all of a sudden the leaves are showing this.

It looks like calcium deficiency. Probably should check pH values.

Is that cal or K?

I think it's K, I would bump up the bloom nutes a little bit next feeding