good job axolotls aren't in the tank as the nitrites are deadly, if your axolotls have been exposed to high nitrites use a couple of drops of methyline blue in the tub water or give them methyline blue baths, nitrites are absorbed into the blood stream which creates a condition called brown blood which is a problem with oxygen levels, methyline blue helps to oxygenate the blood and reverse the condition, using a small amount of salt (ie.. 2g per ltr) in the water will also help counter any issues caused by high nitrogen compound levels.
because the ph test is as high as it will go you ph will need to be tested with the high ph test, as it is though the level is good.
the nitrates are good.