need identify of fish, please

[CMC]

Last weekend we bought 4 small catfish at Petco but don't know what kind they are. There wasn't a sign on the tank and they were scattered among several tanks. We bought them to eat the algae in our 240-gallon tank.

Here is a description: right now they're about 1" long, very slim, gray and have a black horizontal stripe on the body, the bottom of the fish is white and they attach themselves to the glass.

Does anyone have any ideas on what this could be?

Thanks.

 

[ryan]

Sounds like an oto to me or Otocinclus affinis.

 

[CMC]

Thanks Ryan, that's what it is.

 

[Perky]

I would like to say that you should have a lot of bogwood in your tank, algae, and no fish big enough to eat them (grow to 2 inch). I would also advise on buying another bunch of about 6 atleast. Reason being is they are schooling and you have a nice large tank so you could get a lot. Also make lots of hiding places (small and big ones) so when threatend they can retreat to a cave of their choice.