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Originally Posted by donaldbyrd
OK I have a 125 gallon tank heavily planted
Following this sticky I would dose:
kno3 1.5 tsp 3x wk
kh2po4 .5tsp 3x wk
k2so4 .25tsp 3x wk
trace 30mil 3x wk
OK here is where I am confused and need help
according to chuck's calculator this would give me
Nitrate 32.66 ppm I know I am shooting for 20-30 ppm so will back this down to 1.25 tsp which will give me 27.22ppm
Phosphate 10.62 it shows my target should be 1 ppm
Potassium 9.97 it shows target should be 20ppm
Am I missing something ?
From my reading I feel I have the KNO3 down but I am really confused on the Kh2po4 and k2so4
any help would be appreciated
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For a heavy planted 125 you should be in good shape with that regime, Nitrates and Phosphate are more important than Potassium, also take into concideration that when dosing "K"N03 & "K"H2P04 the amount of Potassium (K+) that is going in from those two chemical's(K), target for K+ is in the 15 to 30 ppm range, and after looking at you're plan, I noticed I had a slight typo in the Potassium scale on that one set of tank's, I fixed it, Thank You
So you would actually want to dose close to a 1/2Tsp K2S04 3x week.
KN03 looks good, I wouldn't go any less than 1.25Tsp for a heavy plant mass high light C02 125g tank, unless you have a hefty bioload and feed hard, then you would still need to be alert, you do not want to run out of any nutrient at any time, especially nitrates, and especially during photo period, that would open you up to some mean BGA, its better to have a little more than a tad less, a little more will not hurt.
I personally make sure that my highligh C02 tank's have all the needed nutrient's in the water before the light's come on, I think it is just good practice.
Lastly, KH2P04, target is actually around 1 to 3, but I have ran it as high as 5+ppm with no adverse effect's.
Keep in mind we are dealing with variable's, plant uptake rate's, which I suspect change daily, up, down.
amount of food, bioload etc.
Try not to get to hung up on number's calculators and test kit's untill you learn to read the plant's.
Doing the above regime, will eliminate alot of variable's, especially if you start having some trouble along the way with various algae types, you will need good C02, it's a must, if you have high light, poor C02 will bring in alot of trouble by itself, so dosing enough KN03, KH2P04, K+, Trace,s then C02 is where you need to look.
I hope this help's you, any more question's along the way, we will leave the light on for ya
and keep us informed of how you're plant tank is running, and it's progress.
Thank's