Wow that was quick

Pic of my first ever grow attached. Suffering from lack of room now the 10 litre pot is TOO big. Can I get away with using a smaller one for a shorter plant I wonder?

I've been told not to bother using any extra fertilizer until the flowering stage as their should be enough good food for the plant in your soil if you're using a good quality growing compound (I use Bio Buzz..)

EDIT: sorry didnt mean to hijack your thread!

Andy