Some fish are more sensitive to change than other specie.
For instance Cardinal Tetra, the mistake I have seen many make is they make
the purchase, bring home and toss in community tank, they will all be dead by
the next day.
The question your asking, it will take a sharp drop-fast (I can't give a number)
to stress the fish, if injecting C02 and you see stress it is 95% C02 excess &
lack of 02, so add air/surface splash. you should anyway on a daily basis.
Then reduce/ turn down C02.
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Last edited by Wö£fëñxXx; 01-09-2009 at 05:44 AM.