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i have a 15g aquarium.a white slimmy stuff is seen in the corner of the tank always after water changes.it grows rapidly and spoils the beauty of the tank.so i decided to buy a algae eating fish to ged rid of the problem.can any one post me a pic of an algae eating fish

Not sure what you mean by an algae eating fish. Are you just wanting pictures of different kinds of plecos? If that's the case go to plecofanatics.com there is a ton of info on plecos and lots of pictures. Make sure to read about their size, in a 15 gal. you need something that will stay about 4 inches.

common plecos will out grow your tank, I think he may have bought a chinese algea eater, as I have heard them called. They are very active but can be a bit aggresive.
I am not sure what you mean by white algea, its most likely a fungus or mold, you may want to increase the flow in your tank and see if that makes a difference.

thanks
JR