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12 Posts
I always thought that aquarium gravel is way over priced for what it is.
I like the NPT idea of using soil (dirt cheap) and capping it.
I haven't read the book yet but I did order it. Won't be here for a few days.
My guess is the purpose of the cap layer is to allow just enough O2 into the substrate while restricting the rate at which the nutrients come out of the lower soil layer, and to hold the soil down.
Curious about what I could buy at the local home center to use as a top substrate. I already have play sand left over from my kids sand box. It's really fine though. I'm guessing not more than 1mm. Could you use that and just use a thinner layer?
I've also see pea gravel at the home center. That's much bigger, maybe 3-5mm or a bit more. Not wthat's the other extreme. Would that work in a much thicker layer?
I like the NPT idea of using soil (dirt cheap) and capping it.
I haven't read the book yet but I did order it. Won't be here for a few days.
My guess is the purpose of the cap layer is to allow just enough O2 into the substrate while restricting the rate at which the nutrients come out of the lower soil layer, and to hold the soil down.
Curious about what I could buy at the local home center to use as a top substrate. I already have play sand left over from my kids sand box. It's really fine though. I'm guessing not more than 1mm. Could you use that and just use a thinner layer?
I've also see pea gravel at the home center. That's much bigger, maybe 3-5mm or a bit more. Not wthat's the other extreme. Would that work in a much thicker layer?