What are you referring to when you say 8+ppm? Ammonia? If your ammonia was that high, you must have a really acidic ph, or else nothing would live in that...
Don't mess with your ph unless you REALLY need to... like trying to spawn SA cichlids or something. Most fish will adjust just fine to your ph. And don't use the API stuff. Are you trying to raise or lower your ph? Why?
Oh, and bio media is great, but don't neglect your mech sponges completely. Plenty of space for bacteria on sponges. Sponge filters are also your friend for adding extra bio filtration...
http://www.monsterfishkeepers.com/forums/showthread.php?t=357979