Yea looks like a ph issue.. usually those rust spots mean ph is either too high or low or the ph is fluctuating a lot. You are right about it being a calcium issue i believe but an improper ph balance usually causes that.
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I think its calcium
HahaThat is why I will never mess around with soil. Way too finicky. Coco just feed those bitches all the time and watch them grow. Love it. No overwatering as well.
See I think that's really the key. Regardless of how you grow, k.i.s.s. (keep it simple stupid)I never change. Have a 55 gal flexi tank let it get diwn to a 1/4 full and filler up. Ph for maybe two days then it stays stable for the rest.
Damnit i just went to take pics and it was 1:03... Lights out at 1 .. I fucked around and sat out here doin dabs for an hour or2. Now no pics.. Im tryin to run a journal here..lol ill get em posted in the morning..im gonna start making sure my temps and rh are in the photos as well. To be honest the fluctuate more than id like them too. But never too bad.