I'm trying to figure the doses I'll need for my 95g using EI, but I'm a bit confused...
I took the numbers there (other sites I checked give the same)
Why do the ratios change after 60g?
Under 60g, you dose KNO3 4 times more than others.
Then at 60g KNO3 becomes only 3 times more than others. Except for KH2PO4 which is 3/16tsp instead of 1/4tsp like the others.
Aquariums between 80g and 100g don't seem to exist.
And at 100g-125g, KH2PO4 is again the same as the others.
So in layman's terms... WTF?
Might be best if you mention a bit more about the goal you have with the tank itself, the lighting, CO2 system.
Ferts are rather easy, add them etc. Some do it 2-3x a week, some divide into daily, some dose less and then reduce water changes, some keep up on water changes etc.
But the main drivers of growth and differences in fert routines are light and CO2, they are also the main causes of issues. Ferts are a minor issue.
I just add a non limiting amount of them so I can focus on CO2/light and maximize the return from that.
The ppm's and specifics will vary as do the various folk's advice on it.
On a 95 Gal tank with high light, say T5's, 4x 54W with good cO2 and filtration/care:
3/4 teaspoon KNO3 2-3x a week
1/4 tsp of KH2PO4
Trace mix of CMS+B in (1 liter of water and 6 tsp of CMS+B): 30 mls 3-4x a week
2 tsp of GH after weekly water change
You can do more water changes, say 2x a week if the tank is newer, dose right after. 50-70% is typically what I do.
For a lower light tank, I might only do one water change a month, and if the plant biomas sis low etc, then I might dose say 1/2 or less these amounts.
If I do not add CO2, then maybe 1/10th to 1/20th these amounts and then dose once a week.
I have tanks with all these routines.
No one method will meet all goals, so common sense, and tailoring it to a specific goal is better advice than rigid advice. To do that, you actually have to ask the person what their goal is and help them one on one.