Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Dose it dry for all but the smallest tanks. (30 gallon tank is not a problem at all to dose dry)
Here is what I would do:
Read the Estimative Index chart for my tank size. I see you have used 30 gallons in your example, so look at the EI for 20-40 gallon tanks.
Instead of KNO3, use the same amount of K2SO4.
Dose it the same way as is suggested. That would be 1/4 tsp (dry) 3 times per week.
Yes, the part in red suggests that you use a larger container to make the mix, if you want to make it into a liquid. Try telling it you will be using a 1 liter container. You would then dose twice as much because you are making a more diluted solution.
Lets go back to the EI dose, and try to make a liquid.
If you put 1/4 tsp K2SO4 in ANY size container of water, you would add all of it in one day. So lets just say you put it in 1/4 cup of water, swirl it around for a few seconds, then dump it into the tank. Every day. You get tired of doing that rig-marole and decide to make a weeks worth all at one time.
Put 3/4 tsp in 3/4 cup of water and spread that out over 1 week (3 doses of 1/4 cup each). That is working well, but you think you can do better.
Put 6/4 tsp in 3/4 cup of water and you would spread that out over 2 weeks, but note I did not increase the water? Now you would add just 1/8 cup each time you dose. But because you have put 6 x 1/4 tsp in there, you have 6 doses.
You can go on and figure out however much you want to make up at a time.
OK, lets say you want to use the container holding 500 ml.
You might dose 10ml at a time into your 30 gallon tank. So the 500ml container holds 50 doses.
At 1/4 tsp per dose, you would add
50 x 1/4 tsp to the container. (mumble... mumble...) this comes out to so close to 4 tablespoons that I would do it that way. (12.5 tsp to be exact)
I KNOW that much will dissolve, because that is the way I do it.
50 doses, dosed at every other day (that is, 3 times per week) will give you over 4 months worth of fertilizer.