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Hm I see, had a hellish time trying to get my cories going for air as they were never facing me or too damn fast. I caught this on my Swordtail where he looks kind of bloated but I recently fed not sure if that's why. What other pics would you guys like, I'm trying to get good ones sorry lol.You could just put a small dish or something on the gravel and feed there. Maybe they're not underfed, we need more pics of them to see what is going on. It doesn't have to be a infectious disease it could be poor quality fish.