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It looks like the batmix grew some nice plants up until this problem, always found plagron to produce excellent products.

Fast dog said:

I have can't see any and no this drinks the same and is growing more vigorous the stalk is thicker too

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Yeah wow idk? It's possible you could have accidentally fucked up the buffers or spilt something in that pot of soil. Your plant has a good supply of N which can sometimes make it tricky to diagnose upper deficiencies

Any change after the feed? Wondering if something is in the soil, you should take a pH from the runoff.

why no FE2?

I had plants(never weed)do that when lacking iron

I use plagron regular. Like you said fast dog straight water for first 4-6 weeks then add ur food as soil nutrients running low. So depending how long youve be using that soil for should determine when u add ur food. As for ur problem. How low are ur lights and can u post a close up of under leafs. Imo id of said mite but if uve checked im thinking soils fooked from addin cal mag to a already rich soil ao thts burnt new growth in which case ull need to repot

You checked for spider mite?

can someone please tell me what could be causing this problem?