Corys are virtually blind during the day. Even when the food is in front of them, they will not see it. They will only rely on smell and feel to grope around for food. But once they detect food nearby, especially tubifex worms, they will go into a feeding frenzy. After grabbing a lump of tubifex, they will remain still at one spot while they work on it in their mouth. Because of their sight disadvantage, they will lose out in competing for food with other fish. Thus, Corys are best kept by themselves and not with other fish, also because they are extremely peaceful, non-aggressive and helpless creatures. I have given up keeping Corys (Sterbais) after I realise they couldn't see in daylight, which is a big letdown because they are such adorable little creatures. When I had about a dozen them, the whole lot of them used to line up abreast in a straight line front of the tank waiting for food in the morning. It was such an unforgettable sight.
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