Hi Welcome to Fish Lore
It's tough to lose fish, I know.
I wouldn't worry about the pH, many fish can adapt to different pH's if acclimated slowly. Too quick of a change could harm your fish.
Float the bag and over the course of an hour or so add a bit of tank water to the bag. If the bag gets too full throw out some of it's water. By the time you're done, it should have mostly tank water.
Unfortunatly, cycle contains the wrong kind of bacteria needed to sustain your tank. It dies off quickly and uses up the ammonia the beneficial bacteria need to develop.
You'll have to keep adding it for the life of your tank.
My suggestion would be to stop using cycle and as soon as you have an ammonia reading begin daily water changes to keep the ammonia and nitrite levels down until the tank is cycled. (0 ammonia, 0 nitrite with some 5-10 nitrate)
Or if you can get some Tetra Safe Start, many members have had luck cycling their tank with it.
The cloudiness is probably a bacterial bloom and should go away on it's own.
Can you post a pic of the tiger barb?