Siamese algae eaters will eat that slimy dark algae. Again I would get 3 of them. They will be about 1 to 1 1/2 inch long at the LFS. If you only get 2 usually one will harass the other one. You don't see that as much if you have 3. If they get to be around 4 inches and they seem to be out growing the tank like EMC7 suggested they might just trade them in at your lfs for 3 small ones again I think that would be your best bet at getting that algae under control naturally.
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