I just had a terrifying experience with my 29 gallon! The timer on my solenoid turns on at 2:15pm, my lights turn on at 2:45pm. Earlier this morning, I was fiddling with my needle valve, and I guess didn't crank it back down enough. At 3:40pm I look over to see one of my crystal red shrimp down on his side aimlessly waving his legs. I tried to fish him out, but he swatted himself under a log. At 3:45pm, I notice two more doing the same thing. I would understand losing one shrimp, but three?
I immediately pull them out and put them in a container with some highly oxygenated water from my hospital.. uh.. bucket. I have a 5 gallon tank that was set up just a couple days ago, so the bucket was the best way to not poison my fish. The hospital bucket houses my beautiful German Blue Ram, who was attacked by a horrible silver molly that came with the 29 gallon tank a few months ago. (If anyone in Tucson wants her, let me know, right now she's cycling the 5 gallon tank.)
As I finish pulling out my third shrimp, thinking that there's a parasite or bacteria, a fourth one lands on its back too. Now I'm really freaking out. And all my fish are at the surface...
The CO2!!!! expletive Expletive EXPLETIVE!
I turn the CO2 off and fish out my other shrimp. I grab Pepe, the most peaceful dwarf puffer in the entire world, who was passed out in a corner, and toss him in the container with my weakened and near dead CRS.
I did a 10% water change, grabbed the air stone from the hospital bucket, and tossed it into my main tank.
Within 10 minutes the shrimp were all standing correct again, and Pepe was swimming along peacefully.
They're all back in the main tank now, at 5:30pm, looking much better and eating again. It was almost a disaster. My heart rate finally went down after many drinks of sake and watching them all eat and swim around normally. Funny, the crisis is the only time I got to see my blue velvets at all, as they swam around frantically in distress.