parameters looking pretty good. since you have a little nitrite you should look to see if there is not something you can do to get the amonia before it turns to nitrite and ultimately to nitrate. also you should see about getting the nitrates lower. there are many ways of doing it. revisit your water changes, skimming, cleaning mechanical filters, siphoning out any detritus that accumulates in the bottom of filters etc. once a month at least blow around in the tank to get the detritus under and between rocks etc back into suspension, then when cleared do a water change. hope something here helps. your system is doing great at this point. what it is suppose to do so now is the time to try and get on top of nitrates and amonia. keep us posted.