Angels don't pick on bottom dwellers.:wink:
However anything small will be eaten if they fit in the angels' mouths.
Angels are piscivores. Tetras are their natural prey in the wild. Full-grown tetras and deep bodied tetras like black skirts won't be eaten. This is only for scalare angels. For altums, then say good-bye to the tetras as altums have extendable mouths.
To make it clear, there are 3 species of angels: scalare(the ones you seen in your pet shops), altums and leopoldis. Leopoldis are the rarest. Altums are the most difficult to keep as they are wild and have not been bred in captivity.
Lovely set up i love catfish and angels. I hace driftwood but your flagstone cave is an inspiration... my upside down catfish would love it and it would keep him out of my plant that he'll soon manage to destroy
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