Well I'm with Don on this one, as long as it drains well and you have isopods and/or springtails to do some cleaning you shouldn't have to change the substrate. Between the poop and the insects you should get plenty of fertilization to keep you plants going no problem. By the way i plant directly into my substrate, that way its less likely your plants will get root bound. I use a small false bottoms of hydroballs and as long as you dont over water it the plant roots usually suck up any excess water no problem





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as far as upkeep, clean the poop, change some of the water every couple weeks (make sure you dechlorinate!!) and you're pretty much good.
