It would be interesting to see how the rate compares to the mixes we use. I would still want to use a bubble counter of some sort so I could easily see how much gas was going intothe tank. I've read of people OD'ing the tank with that volume mix if the aquarium is not large. OTOH, the fermentation process might be much slower than the sugar mix we use.
I would think that all the regular cautions are warranted, watch your pH and KH and know what the maximum CO2 is for your tank and what the pH is at that point.