So, I think I made a mistake calculating the amount of ammonia placed into the tank for the fishless cycle. Most of the plants are fine, except the ones I was a tad worried about - the Vals and the Pennywart.
Also, having some issues with the HC staying put in the substrate - rather difficult as the Fluval Stratum is not very fine substrate and so I think the roots really have nothing to cling to.
I've done a water change to correct the ammonia levels, added more biozyme to the tank. I've cut back the Pennywart - all the damaged parts and left the good parts. The Vals are... weeping, but I'm hoping that I may be able to save them - To be honest the condition of the plants I got from the guy in Norwalk weren't in very good condition.
I'll pull them if I see any further deterioration. The filter is starting to see some detrius and mulm which is fantastic! Only a matter of time to have the bacterial colonies build.