Depends on how the tank is setup, which plants you have, and what you are using as fertilizer. Flourish Excel is a carbon supplement, not a fertlizer. Plants are taking in carbon during the day (photosynthesis) so its good to use it every day or every other day.
Micro nutrient fertilizers like Flourish can be used every other day, to around once a week depending on what lighting level you have and what plants you have. If you dose this too often, you could end up with algae.
Nutrients like nitrates can be dosed every other day for high light tanks with fast growing plants or as needed.
Potassium can be dosed every other day.
Just depends on what you're talking about. In a tank with medium lighting and mostly slow growing plants, I'd recommend using Flourish weekly.
|