Tomato plant problems
I'm growing a couple of tomato plants, indoors for now, but over the last 2 weeks I have noticed that some of the leaves are slowly yellowing and maybe curling too.
They are in potting compost, under blue and red LED lights and are on a heating mat set to 22C.
I tend to water them a little twice a day, and I thought they would have enough nutrients in the compost as I only re-potted them 2 weeks a go.
However, I fertilised when I noticed it with a general purpose liquid fertiliser, and again 1 week later. However, hasn't made a difference, or halted the spread
By the way, complete novice, so any help at all would be great. I've had a look at loads of pictures of tomato problems, but struggling to nail it down...