Calcium deficiency or rust fungi?

Hey guys it's me again lol. Sorry to bother you but I'm in a confusing situation. My Gorilla Glue auto from Barney's Farm started showing some rusty spots in the first serrated leaves around day 11. The rust was only on the tips. Unfortunately, it continued but doesn't look that bad. However, now it's not on the tips but there are little circular spots all over the second row of leaves. It's confusing because it's not in the newer growth, which means that it's not Calcium deficiency since cal.def is IMMOBILE. However, when I rub the rust spots, nothing "rubs off" on my finger so maybe it's not fungi as well. Thinking it was a calcium def. I started foliar feeds with 1/2strength calmag. I posted pics below. My GG is currently 19 days old. Any ideas? Sorry for not the best english.

Soil: BioBizz LightMix
Light: 240w Meijiu at 24inches(24/0)
Nutes:
- 1/4strength FirstFeed from Plant!T during first week(pH 6.2)
-1/2 strength First Feed during 2nd week(6.2)
- 1/2 strength silicon max, 1/2 strength biobizz biogrow, 1/2 strength calmag, 1/2 strength epsom salts 3rd week and after.

I raised my pH to 6.5 because all of you recommend that in soil.

Thank you for your time and God Bless.

Anyone?

Possible phosphorus deficiency. Is anyone else having trouble with pictures? I open and only the top portion of the thumbnail shows?

hotrodharley said:

Possible phosphorus deficiency. Is anyone else having trouble with pictures? I open and only the top portion of the thumbnail shows?

Click to expand...

I have to hit the square with the arrow and pull it up on a different page sometimes.