Fish aren't too picky about ph. Yours will be just fine. If you are buying your fish from a local supplier, they are probably used to your ph anyway.
I would recommend a much larger filter for a 29 gallon tank. I have a 100 gph filter on my 10 gallon tank. I have a rena XP2, and love it. Eheim also makes a great filter, and a 2215 would probably be a properly sized filter, and similarly priced. 65 gph will probably leave a lot of dead water in the tank.
Your rummies and cardinals won't school together, but both look great in large groups. They don't really school per se in a 29 gallon tank, but are still fun to watch. With a proper filter, adding ten more cardinals won't be overloading the tank, as long as you perform regular maintenance on the tank.
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