I bought a bunch of fish the other day. On the tank at the store they were labled "Algae Sharks". However, when i search for information on algae sharks, nothing comes up, so i assume there is no actual fish by that name.
They are about 3-4 inches, and look very much like the fish shown here http://www.aquahobby.com/gallery/gseemani.html
The ones I have seem to be a little wider though, they also all have darker round spots that are about 1/3 of an inch in diameter, one on each side behind the gil. All of the pictures I've seen of the Arius Seemani show them as silver, and I havent noticed that dark spot on their sides, but thats the closest thing I can find to what my fish look like. My fish are also silver, but much darker than any of the pictures I've seen of the aruis seemani, one of my fish is even nearly pitch black.
Anyone have any ideas on what these fish are?

They are about 3-4 inches, and look very much like the fish shown here http://www.aquahobby.com/gallery/gseemani.html
The ones I have seem to be a little wider though, they also all have darker round spots that are about 1/3 of an inch in diameter, one on each side behind the gil. All of the pictures I've seen of the Arius Seemani show them as silver, and I havent noticed that dark spot on their sides, but thats the closest thing I can find to what my fish look like. My fish are also silver, but much darker than any of the pictures I've seen of the aruis seemani, one of my fish is even nearly pitch black.
Anyone have any ideas on what these fish are?