Do I need to prune?

First time grower. I have 4 fem plants going(unknown strain). They are 33 days old td. They are growing really bushy and not tall at all. Do I need to prune these gals up? I want to go into flowering in a little less than 2 weeks.

Setup:
432w T5 fixture
Intake, Osilating, exhaust fan
FF trio nutes
Ph water 6.1-6.5
Temps 80-90
Hum 30-40%

Top it rather than prune it..

I wouldnt yet if you plan on taking clones. A couple more weeks and you could get a few off the bottom.

Sorry meant to say this bit 3 out of 4 have already been topped once.