Phago species are extreemly specialised feeders and not really suitable for home aquarium upkeep, they feed almost exclusively on the fins and scales of other fish and as such need large fully scaled feeders which they snip pieces off of with their sissor like mouths, i kept one for a short while and the only thing it would eat was the tails of male guppies which was unpleasent and against my ethics, sadly but fortunately it was another fish lost in the big velvet epidemic i had last year but it is not a fish i would consider keeping again.