the fan is not the issue here , too many plants in that container is 1 issue , the container is another , it has transparent sides and ur roots don't like light at all , this will slow down ur growth . also the tin foil that u have use as a reflector will probably burn if hit with a naked flame. if u ask me and i don't want to sound rude but ur going to have to rethink ur grow setup. compact floros i am not a lover of, 3 or 4, 4 foot floros will give u better coverage of light and the holders for these are cheap and easy to pick up. heat of floros is not a problem , i keep my floros about an inch away from my plants and what it does do it promotes good secondary grow, from what i can see ur fan is fine where it is at