they always seem round but the calico looks a little extra round today I think. I'm not sure I have been a very good fish owner the last week during to my grandma passing away yesterday. for the last week I have been running out of the house every morning, turning on the lights and throwing food in quick. then 12-15 hours later come home turn lights off and go to bed and repeat. I have tired spinch and lettuce in the past they didn't touch either. I did a 60-65% water change yesterday .. the calico that looks most bloated to me has been pooping like crazy the last 2 hours.. they seem normal and happy and scavenging like normal but they do seem a little extra topsy turby ( little more upside down, tail end higher that usual I think) when they are scavenging