barr report dosing question - The Planted Tank Forum
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post #1 of 5 (permalink) Old 12-11-2015, 02:50 AM Thread Starter
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barr report dosing question

Question: Tom Barr doesn't show k2so4 in his E.I. dosing (see pic). Is dosing kno3 and kh2po4 plus micros enough???

I just setup a new tank (planting this weekend ). High light, pressurized co2, e.i., mineralized topsoil. This is my first mineralized ts tank and I'm unsure how soon I should start e.i.?

I have the following dry ferts on hand. Kh2po4, kno3, k2so4, plantex csm + b

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post #2 of 5 (permalink) Old 12-11-2015, 03:06 AM
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Fish food supplies a certain amount of nutrition for a low tech tank. A low tech tank is often heavily stocked, too, so there is a lot of fish food.
If your NO3 from fish food is already reasonably high you may not want to dose very much KNO3. Also, fish food does not have much potassium. So adding K2SO4 as a source of potassium is a good idea, even in tanks that need very little other additional fertilizer.

A high tech tank needs more of all the nutrients. Most of the time a high tech tank has fewer fish, so less fish food. Because of both of these, a high tech tank usually needs a lot more added nitrogen. This is the basis for Tom Barr's Estimative Index.
You will dose enough KNO3 to supply the potassium needs of the plants in a high tech tank. Even at high tech levels, KH2PO4 is not dosed at enough to really count as much of a dose of potassium.
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post #3 of 5 (permalink) Old 12-11-2015, 04:24 AM
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"High-tech" is a vague term, though usually it refers to the addition of pressurized CO2 and ferts. You can have a low-light, high-tech tank, but that probably won't dramatically increase the nutrient demand of your plants over a low-light, low-tech setup.

Between your tap water, KNO3, and KH2PO4, you may have enough potassium, regardless of "tech" level. But it's unlikely that KSO4 will hurt in any case, so even in low-light, low-tech, you *can* add it, whether or not it's necessary. So long as you do regular water changes according to EI method, that is.
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post #4 of 5 (permalink) Old 12-11-2015, 07:40 AM
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The original GH booster that Tom Barr used contained sulfates of potassium, magnesium and calcium.


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post #5 of 5 (permalink) Old 12-11-2015, 12:19 PM
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Originally Posted by Darkblade48 View Post
The original GH booster that Tom Barr used contained sulfates of potassium, magnesium and calcium.
Most GH boosters, Equilibrium being the one I'm familiar with, usually contain a good amount of potassium.
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