Have you tested the NH4, NO2/NO3???
They could be off the charts. If you NH4 or NO2 is high without any NO3, then it definitely is a biological issue. If there is not NH4, but high NO3, then water changes will solve the problem.
Definitely add any plant life you can. Hornwort, Java Moss and Java fern will all help without CO2. If you can try some water sprite and you have the minimum of 1.0 wpg, you will see the nitrates dissappear with the addition of those and regular (40-50%) water changes weekly over the next 3-4 weeks.
Thanks,
Steve
They could be off the charts. If you NH4 or NO2 is high without any NO3, then it definitely is a biological issue. If there is not NH4, but high NO3, then water changes will solve the problem.
Definitely add any plant life you can. Hornwort, Java Moss and Java fern will all help without CO2. If you can try some water sprite and you have the minimum of 1.0 wpg, you will see the nitrates dissappear with the addition of those and regular (40-50%) water changes weekly over the next 3-4 weeks.
Thanks,
Steve