Dont nute untill atleast 3-4 weeks old.The plants are pretty delicate at this point and u will do allot of damage if nuting right now.
About the temps,u HAVE to do something about it!
Get 1 or 2 more small blowing fans on it.
Or a 20$ heater,ventillator from wall mart will do.The ones that keep the space within certain temps are really effective and fixed my temp issue within an hour.
Here are some things that may help you out

:
*Lighting:
4 23w CFL's won't be enough for the grow from 4 weeks veg till harvest.
How to fix:
-Get Y sockets from wall-mart.That way u can use 2 CFL's per socket.
I'm thinking,get 4 y-sockets(like 2$) and get an extra 4 43watt CFL's from wallie.
Screw in the Y-sockets and install the 4 23 watt cfl's and the 4 43 watt CFL's.
4 23watt cfls are simply not enough to grow decent bud.
with the additionall 4 43watters u will get ALLOT better results.
Down the road,if u feel like it,replace the other 23 watters with the 43 watters for even better results!
*Humidity:
Simply get a humidifier from wallie thats like under 30$ to fix this issue if it ever becomes one
*Moisture control:
10$ at wallie and it will tell you when to water your plants whithout worrying that ur watering to much.
*PH tester:
If u dont already have one,get it.
Everything else looks fine!
I hope u get a female!
I will be following this.