I have recently bought 2 Freshwater needle fishes(potamorrhapis guianensis)and although they have settled in fine the only thing i can get them to eat is river shrimp.In the wild they eat small fish,frogs and basicly anything thy can fit in their beak .Will they suffer in the long term from a shrimp only diet or should i start WWIII with the mrs by insisting they be fed live fish (guppies and the like).