Ammonia at high PH kill very very fast. It burn the gill and the fish suffocate.
You should first ALWAYS use RO water as tap water can contain chloramine and if you use a standard dechlorinator or only aerate the water for a day, then the chloramine is still there and will kill. If you use a standard dechlorinator then only the chlorine part is removed leaving the ammonia behind to kill your fish. That does not include anything that the water company can run through, like some desinfectant that can end up in your tank. Bad bad idea to invest in a 150 gallons tank and a lot of fish but go cheap on a 100$ Ro unit.
You should lower your temperature to 77F so that your fish have some break with the dissolved oxygen. You should buy some Seachem Prime and put some in your tank to IMMEDIATLY neutralize the ammonia. Put it every 24 hours until your ammonia is down to normal.
Your out of wack PH might indicate that your KH is low. At a normal KH the PH should be more stable.
And last but not least, your fish could have marine velvet if you recently introduced something new. It might not show on the outside of the fish and only be on he gills and kill your fish. The fact that your fish go sick one after the other is pretty much representative of a contagious disease like marine velvet.
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