Dry Fertlizer Question - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 3 Old 09-27-2011, 06:20 PM Thread Starter
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Dry Fertlizer Question

I trying to determine if I have this doseing correct..

Is this correct: 10tsp of KN03 in 250ml of water gives N03 as 1ml = 0.73ppm, so 10ml would be 7.3ppm and I would do this in my 72g 3 times a week to reach the weekly of 20ppm.

I also read that you can add 1 tablespoon to 250ml each 1ml will result in 1.08ppm of N03 in 10 gallons. So I have 72 g of water. So 7ml = 1.08 in my tank... To get to my target of 7ml 3 times a week I would need to dose what?? 7X1 to get to my tank size and then7 times the 1.08ppm to get the dose... 49ml three times a week.. Sounds high but this is the only I can figure it out..

Once I figure how much to add to 250ml for the KN03 premix and then a dose for the 72gal tank I'll be fine with the other fertilizer.

Really hope I made sense here..

I really would appreciate and help you can give me..


Capt Roy

Capt Roy

"If it doesn't work, read the directions. If it still doesn't work, follow them!!"
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post #2 of 3 Old 09-28-2011, 12:34 PM
I would have to look at a fertilizer calculator to help you there. The first one sound right. Though your overall dosage sounds kinda low that depends a lot on nutrient uptake though. What I have always done with KNO3 is use a standard starting value then just monitor nitrate levels. Because things like bioload add significant amounts of nitrates.
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post #3 of 3 Old 09-28-2011, 01:14 PM Thread Starter
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Thanks for the reply.. I did a little more home work last night and did this conversion... I used 360ml as the bottles I have have a 15ml line so I don't have to guess. Do you think I have the math right..

Thanks for your help..

__________________________________________________ __________
60 80 Gallon Aquariums
+/- 3/4 tsp KN03 3x a week
+/- tsp KH2P04 3x a week
+/- tsp (20ml) Trace Elements 3x a week
50% weekly water change
__________________________________________________ _____________________________
Two Month Mixture (24 15ml doses) mixed in 360ml distilled water
KN03 Target 20ppm Per Week
3/4 tsp 3x week = 2 1/4 tsp week x 4 weeks = 9 tsp = 3 Tablespoons = 12 doses
6 Tablespoons = 24 15ml doses
Calculator shows .4ppm per 1 ml x15ml dose = 6ppm dose x 3 = 18ppm a week
KH2P04 Target 1ppm per week
1/4 tsp 3x week = 3/4 tsp a week x 4 weeks = 3 tsp = 1 Tablespoon = 12 doses
2 Tablespoons = 24 doses
Calculator shows .2ppm per 1 ml x15ml dose = 3ppm dose x 3 = 9ppm a week
Note: This just doesn't work out anywhere.. but all the sites recommend 1/4 tsp three times a week. I'll stay with the recommended dose for now.
Plantex CSM
1/4 tsp 3x week = 3/4 tsp a week x 4 weeks = 3 tsp = 1 Tablespoon
2 Tablespoons in 500 ml and dose at 10ml 3x week

What do you think..

Capt Roy

"If it doesn't work, read the directions. If it still doesn't work, follow them!!"
Capt Roy is offline  

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