I'd get some proper nutrients, flush 'em well, keep the circulatuion fan on 24/7, and do not water from the bottom. (tiz a good way to develop root rot)

I'd let the rootball dry a bit, and slip it out of the container to check the roots. You should see healthy white-tipped roots. If you have brown or black roots, you'll have to either (carefully) trim the dead roots, take clones, or simply adjust watering and keep your fingers crossed. Likely I'd trim the roots and take at least one clone.

What's in the Chempack, and what's it's N-P-K?
Your runoff ph is low. Does your potting mix have any buffers in it? (is it pre-buffered?)
What are you using to check runoff ph?