Ways to slow the flow from yeast based CO2:
Cool it off.
I kept mine on top of the light. When the light came on it warmed the bottle. Lights out, bottle cooled off.
Raise the bubbler. Put it where the CO2 will sheet across the surface. This is wasting some, but better than killing the livestock. When the peak of production is over then move the bubbler to take advantage of the reduced CO2 and not lose any.
Use less yeast. It will grow more slowly, and perhaps start to kill itself in toxins before the population gets so high as to cause problems.
Use Jell-O as the sugar source. Slows down the process.
"Use Jell-O as the sugar source. Slows down the process"