I have no idea if fish can eat peppers. Some are very much vegetarian in their natural preferences but the heat in peppers is a specific chemical, capsaicin, that is not exactly a major source of nutrients for the fish. A quick Google tells me that capsaicin is a particularly strong irritant to mammals but not at all to birds. It seems that birds eating the seed is the main way the plants are propagated in nature. I found no reference to fish one way or the other, but mine are not experimental animals so I will never know from feeding it to them.
On the other front, colors in fish food are often the colors you will see in their wastes. Fish are not especially efficient at digesting their food so the color of the food goes right on through.
On the other front, colors in fish food are often the colors you will see in their wastes. Fish are not especially efficient at digesting their food so the color of the food goes right on through.
