I'm here again for your help, I'll only post this the once this time!!
As you can see some of the smaller middle leaves have developed some yellow spotting. And an older bigger leaf has a larger blemish.
I'm thinking magnesium def? What do you think....?

Click to view attachment
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This is only effecting 2/3 leaves.
E.C@ 1.4
pH@ 5.6
Temp@ 25C
Plant is about 8inch big.
This is not currently affecting any of the other plants.

Thank you
Looking forward to your help.

Hiya beeman,

Wouldn't have thought it magnesium deficit With that you'd expect to see interveinal chlorosis (paling between the leaf veins) starting at the bottom of the plant and marching upwards, with leaves paling (between the veins) and eventually dying.

Could the one bigger splotch be water splash. Don't really know but I'm pretty sure it's not mg def

My L.S.F. sensors just went off Doesn't look like the lsf I've had , though Leaf Spot Fungus is a broad catch-all term for loads of related infections. Has it grown, developed or spread ?

Could snip off the offending leaves and keep a close eye thereafter. Even if it were to be the onset of LSF you'd have caught it early, as !-$mOkeR-! said above. It's always worth researching LSF even if that's not the problem here. I shouldn't worry, the plant in the pic looked overall healthy Cheers

A