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What should I put in my 46 Gallon? It's cycle and it currently contains 2 Blue Rams, 1 Black Ghost Knife, and 4 Zebra Danios. I'm going to remove the Zebra Danios, but not sure about the Blue Rams.
The bushy nose pleco (aka bristlenose or Ancistrus) is an excellent fish for eating algae. They don't grow very big (<4" usually) and they are very well behaved with other fish. If you get one you should also have a piece of driftwood in the tank because they like to gnaw on that too. I would suggest adding 5 or more corys because they are fun to watch and a school of larger tetras. I would avoid any smaller fish, including neon tetras, because as the ghost knife gets bigger it might consider them snacks. Remember that it has the potential to get up to almost 20" long although I'm not sure what the norm is. If you follow this link it will give you more info on your ghost knife including a list of compatible species.