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another idea on the asphyxiation front
Dinya Lalkaka reported apparent asphyxiation of some fish after his first
use of DIY CO2. Several people followed with input on how that can/cannot
be caused by adding CO2. Here's yet another idea.
Plants produce an oxygen surplus only during the day while actively
photosynthesizing. At night they compete with the fish and *use* oxygen
to metabolize the sugars produced during the day. Perhaps adding CO2
allowed the plants to produce a bonus amount of sugar during the day and
at night the larger supply of sugars caused an increased demand for the
oxygen needed to metabolize it. With limitied circulation the increased
oxygen demand could cause lethally low oxygen levels in the tank.
Just a thought.