venting a cooltube properly= negative air flow

hi, i got a small wardrobe im using a 250 hps with a cooltube, now on the cooltube ive got a bathroom extractor as an intake and also 1 as an extraction as well, but the rooms still getting too hot, am i creating negative air flow by having 2 fans on or should i just use 1 fan as an out take and let it suck in air as it needs or should i keep them both on? plz.

Is your intake coming from somewhere that has fresh air or are you recirculating the hot air from your grow space?