Amanos are sensitive to CO2, more so than many smaller fish.
Also NH4/NO2.

They make good "guinea pigs" for test therefore.

Low O2 will also kill them.

So some decent surface current is wise.

The high levels of NO3 I made mention of are really outside most anyone's dosing routines, so there's seldom an upper limit issue and I'd be very surprised to see one personally.

To date I have never heard of someone killing their fish with too much KNO3.
So I'm doing well with the sugegstions and ranges, although there are a lot of folks Crying, moaning, whining on and on about how high levels of "pollutants" like NO3 will harm their fish with EI dosing, to date not one person has shown what such levels are or are not nor shown any evdence that the NO3 from KNO3 is toxic to fish etc within a wide range or an upper range.

Not one person(other than myself).

Regards,
Tom Barr