"Guayni; SAHS" wrote in message ...
I discourage water changes but find them necessary as a quick fix.

What do you need to fix quickly when you change water
in your tank at 70mg/l of nitrates?

As for nitrates, my tank today read 70 on nitrates,
this is my benchmark to do a water change

So your nitrates rise? That would indicate not closed nitrate cycle.

buy I am not to worried about it, NH3 and NO2- are down to zero.

After two years??? They better be zero all the time :-)

Last water change was back in April, if it wasn't because my feeder
fell in the tank I could have waited until November.

Very scientific... :-)