Sand Substrate

[puppyjess123]

Oh and I forgot it loooks so much better IMO than gravel and is worth it.

 

[aaronnorth]

the equation is:

H2S + 3/2 O2 --> H2O + SO2 or you can multiply it by 2 so you will have 2H2S + 3O2 --> 2H2O + 2SO2

We know there is enough O2 in the water otherwise the fish wouldnt be able to survive.