Ph strips - the cheapest I found were $15+tax, so I'm going to wait a bit.

I don't know how to tell you what I mean by filtered water but it comes out of my fridge so it's not tap, and it's very clean?..supposed to be

The fan thats in the cabinet blows at the girly and at the lights. If I open the cabinet door (during the day) and leave the fan circulating at the side would that be fine? (and then close the cabinet at night [to keep it completely dark.])