Get the air circulation correct. Do u have a tent a closet.... self built or otherwise? U need to make sure the air in the closet and the room the closet is located is not stagnant. U said u have a clip fan and this may be ok. How are ur temps. Sometimes getting temps right will fix rh probs. Hope this helps out. Oh don't let water sit in the chamber after watering as this could be where its coming from