Hey cana.. don't worry to much.. I think the plant will grow out of this..

but you definitley need to get a ph water tester... there are hydro stores by you... GH makes a simple one that comes with the chemicals that allow you to adjust your water.. about $16.00

dehumidifer is not needed..

Have you put any nutrients in? You shouldn't have..
What kind of soil are you using...? does it have specs you can give us?

The new growth looks ok..... definitley don't over water.. although you are right.. is is not OWing

keep us posted with pics..

sorry wish I could be more help..

potassium?