[DJRansome]

Which cichlids are in your tank? If we assume they are Malawi because you have posted in the Malawi forum:

What test kit are you using? Hopefully you can get a smaller range on the nitrates (N03) with a better kit?

N02=0 is good
Ammonia=0 is good
N03=40/80 is not good, you should do partial water changes to get the nitrates (N03) down to 10ppm.

Your KH and pH is low for Malawi.

It's a newish setup but the tank has been running a couple of years now? Did you switch to Malawi? How long have they been in the tank?

Don't change anything until you reply and get additional advice.

 

[DJRansome]

If it has been that way for a couple of years, don't change anything.

Except...change a larger volume of water to get that nitrate down to 10ppm. You can do 50% every day until you achieve your goal.

 

[DJRansome]

The pH is low, but after a few years they are acclimated so changes would stress them with possibly no improvement. By avoiding additives you make water changes easier and keep things stable.

If I were setting up a new Malawi tank for new fish I would bump up the pH and KH a little.