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Discussion Starter · #1 ·
Directions on the Flourish bottle say 5mL is enough for 60 gallons once or twice a week. The stickied dosing says for a 20G to do 5mL 3 times a week.

Why the discrepancy?
 

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Discussion Starter · #3 ·
If you are referring to Wolfens EI sticky, that is for a high light, high CO2 setup. Read up on EI (Estimative index) for details.

The label on the bottle refers to a planted tank that doesn't necessarily have 30ppm of CO2 and 3 W/gal and 50% weekly water changes.
Even then, it's still not excessive? I mean, I can understand why you'd need more in our case but 9 times the recommended dosage?
 

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There are huge differences in nutrient consumption between different tanks. It might be excessive for your and my tank, and it might work well for somebody else's tank. Personally, I tend to under-dose, and my dosing is more in line with what you cite from the bottle.

One weird thing I found is that over the years, the recommendations on the bottle/s changed somewhat. An older bottle that I still use for other purposes either contained more concentrated stuff, or they upped their recommended doses at some point in time.

If you have shrimps and sensitive fish, I would suggest to start dosing on the lower limit, while watching your plants for malnutrition symptoms. If plants turn light green, yellow, or even whitish, upping the levels a bit might help.
 

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Discussion Starter · #5 ·
Also, reading on the EI on aquaticcentral, they recommend NOT dosing K2SO4 since there is enough K in KNO3 and KH2PO4 but on the sticky above, the K2SO4 dosage is the same as KNO3 which provides twice the amount of K.

Why is this?
 

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It all depends on what levels you want for your tank.

KNO3 provides potassium, and if you dose lots of it, you don't need to add K2SO4 or such. Recommended K levels are 20ppm, and with KNO3 providing less K than NO3, to get there you would have to overdose NO3, or add in another form.

On the other hand, some folks try to keep their NO3 levels a bit lower, or their water has NO3, or their fish poop so much that they don't need to add any. Then they might have to add potassium from a different chemical.

Basically, it all depends :red_mouth That's why you are seeing different recommendations. Confusing at first, but once you get the hang of it you'll come up with your own schedule and declare it as the new-found truth. ;)
 

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One thing on K. It won't cause any algae if over dosed, but it might limit uptake on some other nutrients. Its alchemy after all.
 
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