Considering your water temperature is 75/76F, your pH is 7.5 and your measured ammonia is 0.1, your NH3 (unionized toxic ammonia), by my calculations would be about 0.002 mg/l.
Considering your test kits ability (tolerance), even a high end reading of, 78/7.8/0.25 would only calculate to a 0.009 NH3 concentration. Both below levels toxic to most fish (0.05 mg/l). However, this is only a snapshot in time.
Unfortunately you cannot measure Dissolved Oxygen, which would be another wildcard in your water quality. Are your fish lethargic? Laying on the pond bottom with clamped fins, or gasping at the water surface?
You can take a fresh dead fish and look for gill color and blood color. Red/Lavender gills may indicate high NH3 and brown blood would indicate high nitrates. Also, fraying of the fins, which I see in your last photo is a sign of high ammonia.
I went try to net a live one with no luck. I may throw the cast net tomorrow and get a pic for y'all to analyze. Today was the 1st day I seen them hit feed. I throw out feed every evening around the pond. Maybe just 2 cups total. I've only seen the minnows pecking at it before.
Got the new fish put in last Monday and only had a hand full of dead ones within a couple days. Probably still from the 1st batch. Hadn't had any die in the last few day. They are doing great and starting to hit feed. Now I need to get my yard graded and grass planted to stop the muddy run off. Been busy building structure with left over stuff from building my house.
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