Join Date: Jun 2011
Location: NE Minneapolis, MN
If you're concerned about a night time spike in Co2 levels, you could put an airstone in the tank, connected to a timer so that it is only on at night, maybe from an hour before lights out to a couple hours before lights on. Then the plants have enough Co2 during the day, and the shrimp will have enough O2 at night while the plants are not producing it. Just a thought.
I have DIY Co2 on 24 hours, but I use a small sponge filter in the tank and it produces bubbles all the time; not the best for keeping Co2 in the water, but good for maintaining a safe buffer of oxygen so I don't gas the critters.
(Proaudio55, what's up neighbor?)