Didn't know where to put this, so no worries if it needs to be moved! But this weekend it's supposed to get up to the low 50's here in central Indiana, so I thought it would be a good time to take my new (used) tanks outside and fill them up to check for leaks. I will be putting some ice cold water into them from my outside hose. My question is will the temp changes (taking the tanks from inside 72 degrees, to outside low 50's, filling with cold water, then bringing them back into 72 degrees when done) be hard on the tanks? I know temperature fluctuations aren't the best on glass, but have no clue as to what extent of change is hard on them. I know this may just be overkill on my part, but better safe than sorry, right?