Well, after last night's 80% water change I'm left with 1 rainbow, 1 neon, 5 white clouds and my otos and shrimp. :(
Also, right now the water has a milky white haze to it. I've seen this happen before after water changes and it usually settles within a few days. So that's not new to me and has never been an issue before.
As for symptoms... just the same as I listed above. They go up to the top for air and float there, otherwise they try to swim and have trouble, usually just getting carried by the current of the filter. The only other thing I can think of is they lose their coloring a bit, but I assume that is due to stress.
As for water perimeters, right now they are...
Ammonia: 0 ppm
Nitrites: 0 ppm
Nitrates: 0 ppm - or just slightly above that
I'm guessing it's the two guppies I introduced. Damn... I guess that'll teach me to have a quarantine tank set up. *sigh* I don't know what else it could be.
When I go out to the store I will buy an air stone and see if that makes any difference. But if anyone else has suggestions, I'd be happy to hear them.