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I have 4 black skirt tetras that when I am not sure if I should be sprinkling the flakes on the surface to allow them to float or should I be placing them below the surface to make them sink? Do these fish have a preference? I feel like they kinda stare at it and don't go for it but when the occasional one starts to fall one will grab it. I don't want to sink them only to find out my fish aren't going to eat them and now I have food stuck in the gravel, atleast at the top whatever they don't eat I can scoop out after a few minutes to keep the water cleaner. Thanks!