Hi all, Just the ammonia. Urea is
<"used by a few people">, mainly because the urea has to be converted to ammonia via biological action (by micro-organisms with the urease enzyme), but there are still risks involved.
Urea is very rich in nitrogen (46%), so you get a lot of bang for your buck.You can work it out from the RMM of magnesium nitrate, whatever it says on the container it will be the hexahydrate (Mg(NO3)2·6H2O) when you add it to the tank.
The RMM of the hexahydrate is 256.4 and Mg has a RAM of 24.3, and you have one Mg atom.
Nitrogen has a RAM of 14 and you have two nitrogen atoms, so 28.
28/24.3 ~ 1.15 and 1.15 x 10 ~ 11.5
This means that when you add 10ppm of Mg, you've also added ~11.5 ppm of N or (4.43 x 11.5) 51 ppm NO3.
The "4.43" figure is the RMM of NO3 (14 + (3*16) = 62) 62 divided by the nitrogen content N = 14.
cheers Darrel