One of the fish(looks like neon and it's a minnow, not sure what it's really called since it was a feeder or wahtever) is pretty big. The stomach is big and It has a red spot on the stomach. Some of the fish is pretty big in the stomach but doesn't have a red spot. What does this mean? It's either blood because of over feeding(the skin is getting ripped?) or its pregnant. I'm not sure.