04-19-2007, 04:41 PM
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When I set up my aquarium I purchased lava rocks and wood.
The holes in the lava rocks have been enjoyed by my Red Tail Sharks, Yoyo's and (lastly but for sure not leastly) my Queen and Gold Nugget plecs. (and once by an angel ~ his extrication without death was an engineering marvel).
The lava rocks proved very beneficial during a disaster handling situation.
During one period when my "learning curve" was very, very steep (approximating y=x*100) I was going through pumps like "true believers" go through "Carter's Little Liver Pills".
One of my staff did not keep up with his pump replacement usage and I "wound up with" no pump and hence no biological filtration.
In order to deal this this adverse situation I "cranked up the air" to the air diffusers in the tank (which were installed for the aesthetics of the air bubbles) in order to increase oxygenation of the tank water as well as produce areas of laminar flow in the tank.
During the three days while waiting for the delivery of a new pump I did not observe any concentration of ammonia or nitrite in the tank water.
I believe that the ammonia and nitrite digestion bacteria which were present in the minute crevices and craters in the rock in the presence of the highly oxygenated water were the reason (as well as the bacteria in the small cracks in the wood).