some help plz X*X*X*X

do these look ok?
this is week 3 now,
this is my first grow so not to shore yet, how many times should i be waterin them?
i got them on 12 hours on and 12 off my mate said ill get better yeilds off them?????
the lamp is a 400w
is the light height ok?
should i have a lil fan on them?temperature with the lamp on is 25 when its not on it goes to about 17-18
i got a carbon filter and extractor fan should i have these on yet or not?
i now a lot off questions but if u could answer one that would be great.
thanksX*X*X*X*X*X

you look to be doing ok so far. Except the light cycle is usually kept at 18 hours of light and 6 hours of dark, or some times constant 24 hours for the first couple weeks at least, this is to allow the plant to grow a nice set of roots and some foliage to facilitate growth of nice buds. In addition the longer you let it in a vegetative state like this the more branches the plant gets, the more branches the more buds. When you change the lights to 12/12 to induce flowering is your decision. Most indoor growers are limited in space, so keep in mind your plants will double and sometimes triple in height during flowering. As far as your fans go as long as the temps arent to high you should be okay with a med. sized fan blowing through the canopy of your plants, but keep in mind you need to exchange the air with fresh no matter what the temps. So as far as distance from the light, with a 400 Id keep it at least 18 inches or more away just to be sure your not frying your new growth. You could either go two ways at this point you can go back to an 18 hour light schedule or leave it. If you change it, do it now or within a few days, you will experience some stress and it may take a few days to pic up again, but youll be alot happier with yeild hope this helps. Keep em happy!!!