Everything seems to be ok with your grow 4 plants in a room of that size make sure that the plants are getting plenty of air flow below it might be an idea to take of the odd big fan leaves just to get more air circleation.the plants at the front look a little smaller so if any fan leaves do cover the tops of the front plants take them off nessessary pruneing.but all in all a good hydro grow and my comments are just by looking at the picture so if they are getting plenty of air circlation then leave them be.nice grow get some buddy in on the 4/5 week this will increase the yeiled alsoget the light has close has possible to ripen them buds.keep green peace.