Thanks for the reply.
I did another 50 ltr water change last night.
NO2 now ~3-5
NO3 now ~80
Tank hasn't had a fishless cycle - I started the tank and ran without fish for first 10 days - then added Neons.
I have vacced the gravel 3 times since startup.
What do you mean by 'maintain'?
Request Help! Tank has been running 7 weeks.
Tank size: 150 ltr
Testing with crappy API test strips, so colouring is a bit iffy...
pH: ~7.0
nitrite: ~5-10 ppm
nitrate: ~160 ppm
kH: ~240 ppm
gH: ~180 ppm
tank temp: 27 C
Using a manufacturer trickle filter mounted in lid - with aquarium wool...