CPO's and CO2

[MDK500]

I have a CO2 yeast fermentation reactor that I had used on one of my planted tanks a few months ago. The bottle is 2 liters and produces about 1 - 2 bps. I was wondering if this CO2 injection could hurt my crays or snails in any way. The tank is 5.5 gallons with a pH of 7.4.
Thanks!

 

[MDK500]

Bump

 

[Lupin]

What species are these snails? Most snails such as the apple snails have breathing siphons that enable them to breathe in oxygen-depleted waters.

 

[MDK500]

The snails are trumpets but I'm worried aout the crays... how will they do?