What's the best substrate to use for an aquascape?
Im starting up a new aquascape tank and im wondering what is the best substrate to use? I have river stoneds and gravel but was wondering if i should get some soil too. Also, how and where do i get CO2 for my tank?!? Does mixing yeast and sugar wrk to produce CO2?? Is there any equivalents?? Someone pleaase help me if you know anything! It would be greatly appreciated!!