Some worrisome behavior is going on with Scrounge, one of my precious bronze cories. Last night Scrounge was playing all happy with Hector, I have had these two cories since my tank was set up and they are best friends. So comical! This morning, Hector was out with all the other fish for feeding, my cats love their pellets and never miss a feeding. But Scrounge didn't feed at all. He's been sitting on the bottom all day, either right by their log or under the log. Just sitting there, and if I go close I see that it looks like he's breathing heavy. Meanwhile Hector has been scuffling around the tank, and then will come back to sit with Scrounge for a while. Water parameters are great, everyone else is active and I can see anything outwardly wrong with him. Any ideas? I would really be sad if this means he's dying but I hate not knowing what's going on, if there's anything I can do. Thanks in advance!