Welcome back mark. You need to keep that ammonia at 0.25 or less as even though the fish seem fine a level of 2.4ppm or even 1.6ppm is very harmfull to them. I sugest a 50% water change every day not every other day is the way to go here. How often do you feed them as this can effect the ppm quite dramaticly?
Dont worry about your nitrates as you will be doing so many water changes as to make testing for them counterproductive.
thanks for reply Tom
I feed them in the moring and at night just a pinch.
i know i have to keep doing water changes but wont i be going round in circles
ie. doing water changes to take amonia out but then the bacteria going out as well so not to build up nitrates to take amonia away. if that makes sense
thanks
Mark