How much substrate?

[Zoe]

I'm wanting to use tropica aquarium soil in a fluval spec V, I'm not sure whether to get the 1.25kg or 3kg bag. I tried using an online calculator but it said I needed 12kg

 

[Angus]

http://www.fishtanksandponds.co.uk/calculators/substrate.html this says 3.7kg for your tank to have a 2 inch deep substrate, i think 3kg will be fine though.

 

[Zoe]

http://www.fishtanksandponds.co.uk/calculators/substrate.html this says 3.7kg for your tank to have a 2 inch deep substrate, i think 3kg will be fine though.

Great, thank you!!