Who told ya that you dont need a intake with most tents,utter rubbish most tent fab is weaved in a way that the smell can not get out.You should always have a fresh air intake or else you are moveing the same stagnent air around.Always go with a few sizes down from your out take fan i use a 9 ince fan out let 6 ince inlet.Someone telling you you dont need a intake fan in a tent could have cost you ounces mate.Sorry to hear about you friends illness i hope smokeing this holy herb will help fight the pain,I exaust into the same room has my room is in and i did the same when i had a tent.Has long has there is a window that you can keep open in that room,if there is no window then try to vent into another room.Back in the day i would have said vent out side but this is not a option,now the police are flying over head 4 /5 times a day and all the uk police now havw flur guns.The one thing that i would add is swop the hid light for another hps and have two cool hoods in the tent this will tripple your weight.Iuse two 600 hps lights and get at least 8 0z but most of the time 10 oz dry,got 36 of my last 4 that i did.Only do a max of two plants per light.Also get some good nutes canna or advanced all though i use both.Here is a list of the nutes and at what stage;
VEG
canna a/b rhizatonoc week 1, 1.1 ec has soon has the seedling has come through or the clone has legs.
canna a/b rhizatonic week 2, 1.2 ec
canna a/b week 3 1.3 ec
canna a/b week 4 1.4 ec
FLOWERING
week 1, canna a/b 1.5 ec
week 2, canna a/b 1.5 ec with 2 ml per litre of big bud from advanced
week 3, " " " " " " " " " " " "
week 4, " " " " " " " " " " " "
week 5,canna a/b 1.5 ec
week 6,canna a/b 1.5 ec plus reco dose of pk 13/14 only use for 7 days
week 7, canna a/b 1.5 ec
week 8,canna a/b 1.5 ec
week 9,water for 7 days.
Hope this helps if i can help in any way in box me,you will notice that i dont ph once these nutes are mixed at this ec they go to around 5.6/6.0.to be honest most water in the states and uk is ok to drink so there is no need to ph..................tyke