Too me they look hungry - not too familiar with Biobizz line but it seems fish “ mix “ is supposed to be used with grow mix.
Apparently “ light mix “ is technically light in nutes. As it is labeled for maybe 3 weeks of nutes.
These multi bottle nute lines always give me a headache since they promote more purchases of nutes just to make a complete feed.
I don’t know if you have other options available but a simple one would switch over to GH MAXIBLOOM ( powder ) …. This one and done feed will power it from start to finish alone. Simple as fuck to use …. Literally one tablespoon to a gallon ( some adjusting for hungrier plants ) but has the ease of water soluble elements that are avaliable to plant. One thing that would help your plant also is EWC ( earth worm casting ) added to top soil.
It not only conditions medium but promotes good plant health and it’s organic.
To me that nute line is just not enough