ok, so for starters, the strip tests are not very accurate or good quality, that also doesn't appear to have an ammonia reading? I would recommend getting a liquid test kit if you can. live feeders like minnows really shouldn't be a staple, you should be offering nightcrawlers or pellets as well. primafix and melafix also shouldn't be used for axolotls, for fungal benefits add some Indian almond leaves and/or do some tea baths if you notice fungal growth. you should be using dechlorinated tap water for the tub and changing 100% at least once daily. It does appear that your pH is also low if am looking at the chart correctly, you may want to try to raise that using some crushed coral in a bag in the filter, also be careful of that if you use IALs.