Here’s a picture of my fish, about a foot long and probably about five years old now. A hardy guy that needs a bigger tank lol
His dorsal fin and tail flares out really large like a sail, but he flattens them down when he’s chilling, so it’s harder to get a good picture of them.
(Ignore the fact the tank looks rather bare, he periodically decides he prefers the decorations to be flat or floating and knocks them all out of place)
One species of Pleco or “Algae Eater”.
(posted in honor of the pet store story that sold to a customer that had a too small and too overcrowded tank. Unfortunately Plecos are often billed as “easy” fish that “will keep your tank clean”, without mention of how they poop a lot and will grow to be massive and won’t prevent you from needing to clean up algae. He’s not a difficult fish, but does need care and special considerations, and a big tank!)