In some of my stocking research I have seen substrate depth specifications for some fish ie. mollies only 1/8". Why does it matter (if they don't burry themselves) and how do the fish know how deep the substrate is?
From various things I have read I suspect that my substrate (PFS) is probably much too thick (1.5-3.5 inches in different places).
From various things I have read I suspect that my substrate (PFS) is probably much too thick (1.5-3.5 inches in different places).