Is this tobacco mosaic or variegation

[Red October]

Only me think they are screaming for sulphur? Overall light colour. Strange vein lightening within the leaf tissues. Yellowing of lower leaves that's a lot bolder than N, almost heading out of yellow towards orange, though very much yellow still.

Magnesium Sulphate

Edit: And the insecticide, of course

Yeah they're seriously underfed, my binding technics to keep them small I'm going to give them a bit of a feed today aswell