hmmm, well the other day i had a problem with my cory which was kind of similar. he was swimming around fine the days before, but then he started swimming in weird patterns and swimming upside down at times, as well as laying upside down on the gravel. immediately i changed 35% of the water, added pH stabilizer, water conditioner, and replaced the filter. the very next day, he seemed to be swimming fine and back to health, just like he is today.
how long has this tank been set up because it might be from 'new tank syndrome' even though you are cycling it. which reminds me, how long did you have the tank up before you actually put the danio in? and make sure you aren't overdoing it with chemicals, because that also can contribute to the problem.
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10-Gallon Tank
Empty
20-Gallon
-TONS of Fancy Guppies
-3 Albino Corys
38-Gallon
-1 Cherry Barb (hoping to get rid of possibly for more schools)
-13 Neon Tetra
-2 Geophagus Jurupari
-1 Red-Eye Tetra
-1 Bolivian Ram
-1 Green Cory
-1 Peppered Cory
-2 Juli Cories
-(a few more cories should do it)
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