Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
I would still dose phosphate and iron ferts on different days, but yes, fewer dosings per week should be fine. Especially with a medium light tank. Are you adding any CO2 or Excel? I would start with the same daily dosing as the EI recipe calls for, but just dose less frequently.
Without carbon you could probably only add the EI daily recipe once a week (That is, one day macros, a different day micros) Net result is 1/3 of the EI accumulation through the week.
If you are adding carbon in any form, then still use the EI daily dose, but just twice a week instead of 3 times. That is not cutting it down much, though. 2 days macros, 2 days micros still means a lot of dosing. Net result is 2/3 of the EI accumulation through the week.
That ought to be enough for a tank that is not a high tech tank.