> At 03:48 AM 7/26/2001 -0400, you wrote: >> Is oxygen saturation a threat to my fish? Is the pH swing stressful to my >> fish? Or are they just acting weird because they don't like swimming >> through the bubbles? 02 saturation is no problem in our tanks.......... in nature it certainly can be......300-500% kills most everything. Algae blooms can produce these kinds of 02 levels. Regards, Tom Barr