yeah, if i use potting soil, some of the fertz in that arent good for animals and the perlite (little white balls) is bad for most animals since they try to eat it. and if i dig up some dirt, i dont know what im getting with it. plus im in NJ, everyone has a garden, but its the most densely populated state, so its all gardens and not too many large areas of untouched nature. i would have a big chance of getting pesticides in the tank, and that would be really bad.
so i used coconut fiber and added animal-safe fertilizer (needed to since coconut fiber is inert, its nearly pure cellulose).
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