1.it almost doesn't change the water parameters, peat will lower PH but because it doesn't have moch peat and because its under 5 cm of quartz it has none or close to none affect
2.it is fish safe, all fish!
3.you can get most of it in a plant nursery, for pumis you will have to find a quarry or a tool workshop.
if you will be able to find half burned clay then put some in too. |