I've been battling low PH since i've moved into my new house. Only solution I can think of is routing the skimmer air intake tube to the outside, only problem is the wall directly behind the tank is my garage. Will exhaust fumes from our cars be a problem? I mean we don't run the cars with the garage closed, but sometimes we'll get in our cars and start them before opening the garage. What about tempertature? Will the hot summers in the garage and cold winters have an effect on my display tank temp?