Hello to you all again.
I followed the advice given and slowly but surely the plant is now flourishing again. Thanks!
A few questions though.

The leaves are looking tonnes better and the plant is growing at a good rate. Will the stems that are still red return to a green colour or will they stay red now?

I want to take a cutting from her but the shoot I'm planning to use as a cutting has a red stem, will it matter?

I've been looking at instructions for building a bubbler... how effective are bubblers and are they problematic?

Thankyou people... one day I'll manage a successful grow and smugly post the pics on here.