Def read RDs thread. I honestly dont know why everyone isnt using it especially if you have canisters.
Short story 1 tbls spoon per 75 gal of water. Lots of methods for adding it to the tank. I put it in a fine mesh bag after wc in let it sit in the tank. In the direction of the filter/sump return, Through out the day i squeeze the crap out of it. The more it clouds the water the better. Either that night or the next day i remove the bag and dump the left over bran. Fish heal so much faster from injuries, filters stay cleaner and water too.
I use safe its a more concentrated version of prime. Lasts a hell of allot longer. I cant remember how long ago i purchased it.
I really wouldnt mess with ph. Unless your keeping really delicate fish or the tap is ph leans way to far in one direction. I can post of vid of how i dose with the ridx just gotta dig it up