03-14-2013, 02:01 PM
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Originally Posted by Boredomb
Ok I was afraid you were going to say that. I knew you was but was still kinda hoping 1" or so might still be okay. LoL
Can one simply add more substrate on top of the existng substrate and it be okay?? Would that not cause problems with bacteria that's already established in the sand?? In other words wouldn't that suffocate the bacteria and cause issues in water parameters??
Wouldn't it be better to take out the existing sand and then add new sand to the desire depth??
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Unless you are contemplating a significant increase in substrate, no to your question. Aerobic bacteria work in the upper layer of a substrate, and in sand this is about 1-2 inches [see my article on bacteria]. However, plant roots release oxygen--most of the oxygen produced through photosynthesis is released via the roots--and you also have factors like snails. On top of this, you want some anaerobic areas, and this is not likley to overload that.
If you have 1 inch now, I would add perhaps half an inch for the crypts.