If you are concerned about feeding the only fish that I suggested that wont eat most prepared fish foods is the eel. Mine only eats live foods. I dont know about the goldfish but you should keep the ph around 7.0. Here are some better pics.
Polypteus delhezi:
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Polypterus endlicheri:
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Indo dat:
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African knife:
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and I could keep all those in the same tank? two of each except the knife?
