They look great, really no complaints, i don't see a fan, but they clearly have good air flow.
Are these fem seeds? Cause you have used your space very well, except when you switch them they are going to stretch and fill out even more, so they are going to be fighting for light big time shortly, removal of males should be enough in most cases, but if these were fem then there could be issue. If you do need to trim, i would start by removing lower growth to get bigger top buds and less little buds.
What lights are you using? What do you plan to flower with?