What PH do you all keep your fish in? Also, what do you feel is the best PH for a variety of different species in the same tank. I have heard 7.0 is ideal for all around. I have never really messed with my PH and have never had a problem with any of my fish and it is at 7.6. Just wondering if I should lower to 7.0 for better fish health?

A stable "not ideal" pH range is better than a fluctuating "ideal - not ideal" pH. In my tanks it's around 7.2 and everyone seems happy and healthy. 