Quote: Originally posted by mojoreef
Arent plenums supposed to be large gravel??? or has something morphed and I missed it again
MIke | the reason for the different sizes of sands and agronite, is so that the further you go deeper into the bed the tighter the flow is through the grains. also the smaller the grain the more surface area for bacteria to grow. (same principle as a DSB) the 1" of finer sand is a tight zone above the plenum. allowing more anaerobic bac to grow. the layer of screen is to prevent burrowing critters from stirring this zone. the higher lever continues this zone but some critters will penetrate it. the larger agronite will mix somewhat with the sand filling the gaps. then the top layer of agronite is to allow 02 to flow through this level and as a decorative non-sandstorming surface.
i dont know all the science behind it but have had short term success in the time that i have had it on my reef.
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i say this as my best advice to a beginner. do not,,,and i repeat,,,,,DO NOT look at my tank as an example....i have a well practised eye, decades of experience, and a trunkload of failures to allow me to force the issue and get away with things most cannot~ Quote:
Originally Posted by Amphibious  I couldn't agree more on your statement above. With 61 yrs in the hobby, the last 41 yrs in the saltwater end exclusively, I, too, can do things that others should NOT. | |