answersLogoWhite

0

below 30 ppm at all times

Nitrates (NO3) have been studied and observations show some species of fish can withstand up to 100 ppm Nitrates without showing ailments. An aquarium should never exceed 30 ppm and a good safe level is around 15 - 20 ppm. If you have no plants in an established aged aquarium then 0 is just fine, but unlikely.

User Avatar

Wiki User

14y ago

What else can I help you with?