add NO3 and K booster or not? - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 10-28-2011, 08:07 PM Thread Starter
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add NO3 and K booster or not?

my tapwater contains 40ppm Nitrates and my tank has 30ppm Nitrates registering at the end of the day. Is there any benefit to adding anymore nitrates in with my fertz do u think? Its currently been restocked with plants so nitrate consumption will be higher when things take off.

Water is very hard in my area.
306.5calcium carbonate (mg/l)
122.6calcium (mg/l)
Do I still need to add formula K?


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post #2 of 7 (permalink) Old 10-28-2011, 08:20 PM
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Everytime you change 50% of the water in your tank you are adding 20 ppm of nitrates. If you do that twice a week, with relatively high light, you likely have plenty of nitrates. But, if you only top off the tank as water evaporates, the nitrates will be used up within a week or so, so you will need to dose nitrates.

With water that hard you sure don't want to just top of the tank with tap water, or you will soon be able to walk on the water! The calcium will keep on building up.

None of that data says anything about potassium (K), so I think you can assume that you need to dose potassium, as K2SO4, for example.

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post #3 of 7 (permalink) Old 10-28-2011, 08:35 PM Thread Starter
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potassium is 1.44 mg/l K I dont know what that means

What do u mean about calcium building up please? Does it build up if not changed out?
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post #4 of 7 (permalink) Old 10-28-2011, 08:47 PM
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you know. i'd like to know my self how calcium builds up

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post #5 of 7 (permalink) Old 10-28-2011, 09:19 PM
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Originally Posted by growingthings View Post
potassium is 1.44 mg/l K I dont know what that means

What do u mean about calcium building up please? Does it build up if not changed out?
When water evaporates the Ca that is in that water does not evaporate so you have the same amount of Ca in a smaller, albeit slightly smaller, volume of water. Replacing the evaporated water with more calcium containing tap water then raises the amount of Ca in the tank, once again, only by a very small amount. Doing regular water changes will of course slow the build up of Ca. It seems like it would take a really long time though for the Ca to increase any significant amount, whatever that would be.

If it were me, I'd just top off the tank with tap water, do regular water changes and not sweat it unless I noticed some issue.
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post #6 of 7 (permalink) Old 10-28-2011, 09:34 PM Thread Starter
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When water evaporates the Ca that is in that water does not evaporate so you have the same amount of Ca in a smaller, albeit slightly smaller, volume of water. Replacing the evaporated water with more calcium containing tap water then raises the amount of Ca in the tank, once again, only by a very small amount. Doing regular water changes will of course slow the build up of Ca. It seems like it would take a really long time though for the Ca to increase any significant amount, whatever that would be.

If it were me, I'd just top off the tank with tap water, do regular water changes and not sweat it unless I noticed some issue.
aaaaaaaaaaaah... i should have known that since i have brackish tanks and similar goes for salt content. Duh! Thanks for clearing that up

Dont suppose the potassium values mean anything to you do they? Im only just getting into the whole fertz thing and in the past have only dosed with gravel tabs and a bit of Trace and some iron.
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post #7 of 7 (permalink) Old 10-28-2011, 09:38 PM
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aaaaaaaaaaaah... i should have known that since i have brackish tanks and similar goes for salt content. Duh! Thanks for clearing that up

Dont suppose the potassium values mean anything to you do they? Im only just getting into the whole fertz thing and in the past have only dosed with gravel tabs and a bit of Trace and some iron.
The K is 1.44 ppm. I believe EI recommendation for K is maintaining K around 10-20 ppm. The recommended dose of ADA Brighty K adds around 3 ppm per day which comes out around 20 ppm per week. So you'd be fine to dose additional K and might even find it necessary.
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