is this the correct thing to use? https://www.amazon.co.uk/d/Pet-Supp...14057&sr=8-1&keywords=seachem+stability+500ml
Seachem Prime concentrated conditioner - 250ml https://www.amazon.co.uk/dp/B0002568S6/?tag=
That bottle wpuld last quite a while. Get the 500ml bottle if you dpnt mind paying £6more
Edit: i think 250ml treats 10,000 litres according to amazon?! Bear in mind youll be using some every water change in the future