Dosing EI dry ferts for the 1st time - The Planted Tank Forum
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post #1 of 3 (permalink) Old 07-17-2009, 01:16 PM Thread Starter
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Dosing EI dry ferts for the 1st time

Just want to make sure Ive got this all right.

I have a 75 gallon moderately planted (planted well but not very dense). 2x54W T5HO's and 1 regular fluorescent, pressurized CO2.

50% H20 change-weekly
3/4 Tsp-KN03 3x a week
3/16 Tsp-KH2P04 3x a week
1 Tsp-GH booster once a week
15ml 3/16Tsp-Trace 3x a week
4-8ml-Fe/Iron 3x a week

Here are my questions...

I have a PH of 8.6 according to me water report, but it measures 7.2 in the tank, so do I need a GH booster? but im not sure as I cant find the GH on the report.

If I dont need a GH booster would I need to dose K2SO4? The old charts suggest to does K2SO4 but now Im seeing the GH booster in its place.

Also Im reading that with high light you would need the K2SO4... since I have high light would I need to dose K2SO4?

Now I have a 75 gallon but there is 3 inches of substrate in there and a lot of rocks and plants, with that I may have more like 60 gallons of water... my tank is only moderately planted so Im wondering if I should follow the 40-60 gallon or the 60-80 gallon recommended EI dosing chart?

Here is my plan, please let me know if this is accurate (I can adjust if it is established that I need the K2SO4)...

Sunday-----Day 1) 50% H20 change, 3/4tsp-KN03, 3/16 tsp-KH2P04,
Monday-----Day2) 3/16 tsp CSM+B,
Tuesday----Day3) 3/4 tsp-KN03, 3/16 tsp-KH2P04,
Wednesday-Day4) See day2
Thursday---Day5) See day3
Friday------Day6) See day2
Saturday---Day7) Nothing

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post #2 of 3 (permalink) Old 07-17-2009, 01:56 PM
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I'd dose for a 75gal tank since EI is an overdose anyway and your doing 50% wc's anyway.


I'd keep dosing the GH Booster at water changes as it's a 'boost' for after you remove all of the trace from the tank and it's very small quantities anyway (Potassium Sulfate, Calcium Sulfate, Magnesium Sulfate).

- Brad

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post #3 of 3 (permalink) Old 07-17-2009, 04:02 PM
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You could cut the dose to about 1/2 the suggested amount with the density and the light you have and be fine.
Later, you could go 2 weeks between water changes once the tank settles in.
More will not hurt though.

CO2 would be the main thing to keep a good eye on.

I do not think I've told anyone to add K2SO4 for many years now, high or low light. GH booster after a water change, but that's about all(it's about 50% K2SO4).

Tom Barr

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