Newbie needing help...

Hi! I have six plants, bagseed, 7 weeks old from seed (1 week of flowering) and they are starting to show their sex. They are in soil under a 400w hps. I know the temp and the pH are a bit high but they've been like that from the beginning (in fact, the temp was even worse). I fed them BioGrow and Hesi SuperVit. As I started guessing their sex (some of them already confirmed) I started feeding them small doses of BioBloom and today their first TopMax. I still feed BioGrow, but at a lower dose.

The thing is, one of them has some of it's top leaves burnt, mostly in a yellow pattern but in some places it looks grey or bluish. Apart from that, she's doing fine!

Any ideas?

Thank you!

anyone...?

How close are they to the light?

It's most probably nute burn, your feeding them small doses, but small doses of everything builds up to 1 big dose ... I'm sure someone with some more experience will say for sure but I reckon lay back on the nutrients for a while, do your next fed with just water... you should only really be giving nutes every 2nd or 3rd water.

so: Feed, Water, Water etc.

that way nute's don't build up and cause all sorts of problems.

and you should only really be feeding biobloom in flower, they only need small amounts of nitrogen. (dont know about top max but I think you use it nearer the end of flower)

if its tops then prob a bit close to light, if bottom fans then nute burn

It's on top. But the others don't have this symptoms. I already did move the light back a bit (do it every week or so).
I feed them every 3rd day. My schedule is something like this: feed, water, water, feed, water, nothing, (...) and so on.
The only thing different is that she's the one closest to the fan. Is it possible that this is the cause?

Cheers!

keep an eye on it and see if starts to spread, sometimes they bleach out and sometimes they get all sorts of colours in them but keep an eye on it.