Brown spotted leaves

Well, you SAY there are no nutrients but your plant is telling us otherwise... the leaf tips tell us there's nute burn and I'm betting that comes from overdosing on nitrogen (also get this from the very dark green of the leaves) - but this has caused a lockout which has resulted in a calcium deficiency (indicated by the brown spots....) These are so young, I wouldn't flush... just give them plain pH'd water for the next week or so and then GRADUALLY introduce nutes to them... don't know if these are autoflowers or photoperiods but you want to use 1/4 strength nutes if they're autos, 1/2 strength if they're photos... The only other thing the spotting could be is a result of your spraying with H2O2 if you sprayed when the lights were on.... always spray anything just before lights out... Good luck!

This is caused by calcium deficiency. Around this phase of the grow you should start feeding with nutrients. And a pH regulator. Keep the pH during the entire grow pH around 6 Start with grow nutrients and give cal-mag once a week. When early flowering change the grow nutrients for flowering nutrients. And cal-mag once a week. When late flowering add a PK booster and cal mag once a week. Last week just pH 6 water.

You may have chlorosis and unfortunately there isn't anything that you can do but start fresh.

well, that's probably why.. looks like a calcium deficiency. flush only when there is catastrophe... it's a tool for a specific and hopefully uncommon context. it's more OCD-related when you do it often. you hadn't even added any nutes, so what is flushign doing for you? it's to combat toxicity or attempt to reblance a whacky pH in substrate etc... it has a use, this is not it. now, soil will provide for a while, but you will often need to supplement it on the way. increasingly so as time goes on until you are providing nearly 100% of need after a month or two even with "hot" soil. it will run out at some point. if you stick to same products, you'll know what it likely needs and when -- take notes. preemptively avoid the problem next time.

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