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Dosing amounts, nickel sulfate vs ammonium nickel sulfate

JacksonL

Member
Joined
27 May 2015
Messages
123
I am hoping someone can give me a quick science lesson so I can work out how much ammonium nickel sulfate to put in my micros.
The IFC calculator has nickel sulfate in it, but I assume there is less nickel per gram in my ammonium nickel sulfate, so I am wondering how to work out what percentage of the weight in each substance is nickel so I may work out a multiplier to convert the weight the calculator tells me to add into the amount I actually need to add.
thanks in advance
 

Ria95

Member
Joined
11 Aug 2021
Messages
78
Location
DE
Assuming you mean the hexahydrate version of ammonium nickel sulfate and heptahydrate version of nickel sulfate, multiply the result for NiSO4*7H2O by 1.4
For hexahydrate versions for both, multiply the result for NiSO4*6H2O by 1.5
 
Last edited:

Happi

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Joined
15 Jan 2012
Messages
445
Location
UTAH, USA
@JacksonL
Are you referring to (NH4)2Ni(SO4)2·6H2O ?

 

JacksonL

Member
Thread starter
Joined
27 May 2015
Messages
123
Are you using RO water and looking to remineralise the water column? If not, you may not need any nickel at all. APF-UK micros have worked fine for me and are:
  • Fe 8.2% (EDTA Chelated)
  • Mn 1.82% (EDTA Chelated)
  • Zn 1.16% (EDTA Chelated)
  • B 1.05%
  • Cu 0.23% (EDTA Chelated)
  • Mo 0.15%
I am using RO. I’m also dosing urea and even though I have read conflicting information on the need for nickel I am looking to play it safe and add trace amounts
 

_Maq_

Member
Joined
23 Jun 2022
Messages
342
Location
Czech Republic
Nickel was quite late to get added to the list of essential nutrients. The reason? It is very difficult - even in laboratory conditions - to execute biological tests while ensuring that no nickel is present.
Plants' demand for nickel is microscopic. Quite a lot of nickel is in pollen. Are you sure no pollen grains find their way into your tank?
Maybe I'd rather tell it straight: It is highly unlikely that nickel deficiency would ever occur in any tank.
 
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