Anoxic - Low oxygen.
Aquarium Salt - Additive-free salt which is used in the treatment of certain freshwater fish diseases or conditions, ...
Anoxic: Deficient or lacking oxygen.
Antenna (pl. antennae): A pair of segmented appendages located on the head above the mouthparts and usually sensory in function.
Anterior: At or directed toward the head or forward part of the body.
All substrates are anaerobic (or more correctly anoxic, without free oxygen) below about a half inch of the surface. As you go deeper down the oxidizing chemicals get used up by certain bacteria types (aerobic, facultative and anaerobic).
In the summer months the sediments became reducing (anoxic), resulting in release of P into the surface waters.
These fall into two categories, the anoxic bacterial, and the plant/algal scrubbers (discussed in the next section).
It lives in a variety of water types, from anoxic conditions (slack water zones surrounded by dense vegetation) to slightly turbid but free-flowing streams. It can be found in waters with pH ranging from 5.8 to 8.
Typically this void space is 1 inch deep and this area becomes anoxic, or an area low in oxygen.
The jaubert style of filtration uses a thick layer of live sand on top of a plenum to provide a small void under the sand, this does a roughly similar job as the deep sand bed, encouraging anoxic conditions to be developed, ...
A deep sand bed is anything over 4 inches deep. You start to get anoxic (low oxygen) conditions and anearobic conditions that will aid in denitrification at around 4-5 inches.
Unless the dissolved oxygen concentration is kept high in the curing vessel, the bacterial bloom fed by the initial die-off will cause the curing vessel to become anoxic, and even more life will perish.
however as I currently have a very low bio load ( five fish) compared to the tank size, it is working fine. As I increase the number of fish I will add more rock. My sand bed is about three inches deep which is the minimum depth to have an anoxic ...
The lakes are permanently stratified (meromictic) due to a strong chemo-thermocline and the lake bottom in the deep areas is covered by purple sulfur bacteria well adapted to anoxic conditions of the bottom water.
These are also the bacterial breakdown products from bacteria reducing sulfates or carbon compounds under anoxic (oxygen-free) conditions. And they can do very bad things to the fish in the tank.
This is of benefit to rooted aquatic plants since under anoxic conditions Fe, P and N are more readily available than under aerobic conditions. Second, nutrient concentrations are higher in a fertile soil than in the overlying water.
 See also: Water, Fish, Aquarium, Species, Algae
  
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