11-21-2012, 02:19 PM
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Originally Posted by pop
I guess I mis-understood. I thought you could put down a layer of potting soil then a layer of clay and last a layer of sand making a safe and healthy environment for the bacteria. I guess substrates do shift.
Well its not the first time the my ole neutrons misfired.
I was curious about the deep sand bed because that is a concept for marine systems where there is basically no fast growing true plants. So the idea is to setup an anoxic/anaerobic bacteria area in a deep sand bed to process nitrates.
If this is for a freshwater planted (and suspecting you were talking about my layering idea
), what I use is 1" of peat moss, 1" play sand next, then 1" pc select (or aquarium gravel) on top.
The play sand I use is just play sand from home depot, lowes, walmart and so on. Be sure it is not silica free play sand which is actually calcium carbonate. While that sand (labeled tropical play sand) is desirable for deep sand beds in marine system, for Freshwater system is does dissolve and become hard. So in the freshwater system heed to "not fit for aquarium use" warning. For marine systems ignore that warning.