I don't get 28 days out of a mix like the instructions say for the
nutrafin
kit.. I get 14 days.


Maybe it has to do with only haveing one in a 200 Gal tank? Mine lasts
over 28 days.

Woops, sorry I think I misread your post. I thought you wrote 200G but
it was 200L.


size of tank cant make any diffrence to co2 bubbles, But the temp of the
room might.
the amount of co2 may not be enough for the tank ?

David