you wont find many fish that will be any more aggressive than an oscar and GT when it comes to feeding feeders. how big are your oscar and GT?? Somthing must be wrong with those guys because I have an oscar that I feed guppies too and if the guppy is lucky enough to slip away at first introduction my guy doesn't quit until that guppy is submitting between his jaws. Im not saying something is wrong with them physically im just saying thats not really normal behavior from those two species when it comes to live food. They are both carnivores
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