AK-48 issue: Nute burn or Potassium deficiency or am I off?

New seedlings just began germinating. 100% germination, they all hatched this morning. Another aventure begins! Friends suggested to try guano instead of granular common fertiliser. Any advice on this batshit thing?

Not with new seedlngs anyway. Wait till there in vegg stage jand ready gor transplant intovfinal grow bucket.

Will

Did you ever find out what this was mate mine are doing the same ???

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