what has happened to my bronze cory's?

[son2fu]

for some reason, this morning until now, some of them are barely moving, are they resting for night or what?

 

[WaterPond]

what are your water parameters

pH
ammonia
nitrite
nitrate

?????

 

[SparKy697]

Have they not done this before? I have Schwartz's corys and they will sit in one place for quit a long time. I can't say that I have seen them sit for the whole day though.

How are they breathing?

 

[majolo]

Also, how long have you had them? When I first got mine, they were on the move 24/7. After a few weeks they settled in and would spend part of the day resting on the gravel "napping." How do they look otherwise?