Whats my problem!!

Can someone help me figure out what this problem is? The strain is Mango Smile by Mephisto Genetics. Im using FFOF, PH adjusted tap water that sits out for at least a day, and light cycle is 24/0. I haven’t added anything extra except magcal once but it didn’t seem like they needed it at the moment and i think it slightly negatively effected the plant because i saw a yellow spot on the leaf a few days later and stopped. I also have a little algae on the top but its old so im almost sure its not overwatering. This is my first grow so please take it easy on me if its obvious lol.

I'm not seeing your problem, the leaves look okay. Maybe the beginnings, or most minor of traces, of interveinal chlorosis. Just keep doing what you're doing.

Don't panic and start adding useless junk. The worst thing you can do is see one spot on a leaf and start throwing everything under the kitchen sink at it lol. Looks fine, don't worry.

Looks like the beginning of magnesium deficiency.

Repeat of previous 3 posts- relax, looks good, beginning of chlorosis between veins, first guess is beginning if Mg def. best advice was don’t overreact and add all kinds of stuff. I might do an Epsom foliar?