Join Date: Jan 2017
Location: South New Jersey, USA
I didn't see any really direct answers, so here's my attempt:
PH: 7.6 - slightly high, but no big deal. Target pH depends on your fish. Most like pH around 7.
High PH: 7.8 - use the high pH test when your pH starts to get higher. That you measured 7.6 with one kit and 7.8 with the other, it should give you an idea of the general margin of error with these test kits. Again, no big deal.
Ammonia: 0 - should always be 0. Harmful to fish. Fish produce ammonia as waste, then bacteria in your tank break it down into Nitrites.
Nitrite: 0 - should always be 0. Harmful to fish. Other bacteria break down the Nitrite into Nitrates.
Nitrate: 5 - pretty good. If you don't have plants, then keep this as low as possible for the fish. If you do have plants, then keep this above 0 but not too high. Somewhere in the 5-20 range is good for the plants to use as fertilizer, but won't really harm the fish. A water change is about the best way to reduce nitrates.
GH: 14 drops needed to turn from orange to green - fairly typical, but I think it's on the hard (high) side. For most fish, this is fine.
KH: 9 drops needed to turn from blue to yellow - a bit on the high side. I think something like 4 is more typical. Should be fine for most fish.