WPG is horridly outdated, do a little research and you will find that out. Factors such as PAR, depth penetration, and reflectors are more important, as well as the type of bulb. Your T5 lighting should allow you to keep softies, LPS, and even some SPS depending on where they are placed in the tank.
Are you sure it's T5 though? I have heard of 65w PC bulbs, but not 65w T5. Are there two tubes that are connected to each other on the same connector/socket? If so, you have PC.
Don't worry about your pH, your weekly water changes will buffer that for you. As for other parameters such as nitrates, ideally they should be 0, but this is not always possible, so levels of 10 are generally safe. If you keep zoanthids (soft coral), they are usually a pretty good indicator if something is wrong as they will close up IME.