There are species that follow other species for the purpose of eating feces.
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I had large comets (goldfish) that would follow my Oscars and arowanas around so that when they pooped he would be right at its ass to eat the poop. The comets kept the tank clean and free of uneaten food and droppings.
You never know what oddball has in his tanks.
Also if the setup is of the planted variety, then generally one does not worry about fish poo...
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There are species that follow other species for the purpose of eating feces.
Sent from my SAMSUNG-SM-N900A using MonsterAquariaNetwork App
I had large comets (goldfish) that would follow my Oscars and arowanas around so that when they pooped he would be right at its ass to eat the poop. The comets kept the tank clean and free of uneaten food and droppings.
Except its own.goldfish make a LOT of chemical waste, not only from the rear but from their respiration.