Lets play a game of what is this? Strange leaf cracking with discoloration.

[Kernowbis]

Been having quite a few problems lately, this being one with my auto dark devil from sweetseeds @ 3 weeks so veg still, never seen this before.... any help would be appreciated!

Biobizz lightmix soil
Biobizz nutes (fed only fish mix with a 1/4 dilution) with a little epsom salts
room VPD @ 1.2, humidity between 55 - 60%, temp around 23c

water PH before adding nutes is around 7.5, i'm sure most of my issues are due to PH, but as i'm organic, PH'ing is generally frowned upon, i'll be switching to synthetics after this grow as i'm done with trying organics, had nothing but issues, i've checked for bugs, we are bug clear.

any ideas?

 

[Gmix]

Bio bizz strikes again

Lol honestly it gives organics a bad name with its 8-10 bottle line up.

7.5 could be to much for the soil to buffer. I know 8 is from when I added to much de that it knocked my ph up.

Phing won’t hurt. I’ve done it on a organic grow when I did have that ph problem
Normally I don’t however as said I did have to once and it didn’t hurt