08-17-2007, 11:50 PM
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I hate to say this "but who knows"!
As best as I remember I had two GN's die (many months ago) with "no signs of anything" while alive and a detailed postmortem examination did not reveal any anomalies (this examination included observing the surface in detail as well as, what I believe would be termed, a minor autopsy.
The water parameters were OK, no aggression noted when viewing my fish, plenty of oxygenation, etc.
GN's are moderately sensitive fish (although not even close to the class of Queens in sensitivity).
Out of the six which I started with at approximately 1.5" I only have two left which are approximately 6". (Please note that I would have four left if not for experimenting with an "off breed" liquid fertilizer several months ago which was accomplished in order to prepare a "Member Submitted Article").
The following may "seem like a weird assertion" but
IMHO the longer a tank has been active and therefore the more experience the fish keeper has with the tank, filtration, fish, etc. the less water testing that is required as well as an increase in the success ratio of raising fish.