What does that mean that you use the best recommended water for your city?
Many of your fish have not been appropriate species for this size tank. Not saying that's why you're losing them, but it could have a hand in it.
What are your EXACT readings using what I assume is the API master kit?
If there was that much difference between your water and that of your lfs
, then your acclimation time wasn't nearly long enough. You would've had to do drip acclimation.
75: blood parrots, featherfin cat, emperor tetras, turquoise rainbowfish, BN plecos, japanese trapdoor; 46: WCMM, gold inca snails, ghost, bamboo & amano shrimp, kuhli loaches, rummynose & ember tetras, endlers, platies, flame gourami, guppies; 16: pygmy, peppered, loxozonus corys, otos, assassins, RCS ... ~ Research PRIOR to purchase.... ~