02-24-2009, 02:22 AM
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In my mind,, Tolerating low levels of toxins and Thriving in same,, are two very different animals.I have seen common bullhead catfish burrow down into the mud in otherwise dried up ponds only to emerge after rains have come and replenished the water. In the aquarium,,, It becomes critical that toxins are removed and kept at a minimum in order for fish to thrive. Even moderate or low levels of ammonia, nitrites, and nitrates affect the ability of fishes blood to absorb/hold oxygen thereby increasing respiration and stress levels which some ,, including myself, associate with increase in suceptibility to pathogens,bacterial infections,fungul infections and or parasites. Best prevention is to train ones efforts not so much on keeping fish, but rather on keeping water.