Plants Deficient? Question

I’m trying to figure out where my plants are deficient but I can’t exactly pin point it... I’ll provide plenty of pictures... I’m thinking nitrogen or carbon... but I’ve watched many videos where people don’t have issues where they don’t diffuse carbon, so I’ll leave it up to ya’ll... it seems my long stem plants only have new growth and old growth is gone :/. I moved my corkscrew val into 10 gallon and it’s doing better. A few of the plants I just put osmocote pellets near to see if they’re needing fertilizer near in the sand. I’ve been using a liquid fertilizer. I might start using CO2 liquid again. Anyhow pictures will be below.

 

They are probably light deficient...

Anubias and Java fern can tolerate low light but both have their rhizome buried which will eventually kill the plant.

 

Should I just float them then?

 

You can tie them to driftwood or a rock.

 

Hmmmm I’ll try that...

 

...or just pull them up a bit, roots can go into the substrate but the rhizome should see the light.