
Hi Amich,
WELCOME TO FISHLORE!
If you got bio-spira, did you already set up your tank? The bio-spira has to be refrigerated until put in the warmed tank water, then you need to have fish also. The bio-spira will only work if fish waste is going in to feed the bacteria. These don't have to be your angels, as a matter of fact I would wait on the angels for up to 6 months until your tank is completely settled.
Don't mess with the ph, or hardness. Most fish can adapt to your water, if you acclimate them very slowly. My best suggestion for angels, is a drip acclimation system, or in the very least take 2 to 3 hours adding 1/4 cup at a time of tank water in with the fish you are floating in a container from the store. After most of the water is tank water, net the fish out and place in a dark tank, and do not feed for the first 12-24 hours.
Corys are a good tank mate for angels, unless they are breeding, if your angels do pair, you should move other fish out of the breeding tank. Good Luck, and I hope others that know more than I do on angels will answer you also.