can you put a black ghost knife fish with a 5" COMMON pleco, and a 7" red oscar?

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yes they should all get along fine as they are big fish but don't put any fin nipping fish with the bgk fish or any smaller fish than what u have or they will just get eaten but eventually u will have to up grade to a bigger tank good luck
 
yes they should all get along fine as they are big fish but don't put any fin nipping fish with the bgk fish or any smaller fish than what u have or they will just get eaten but eventually u will have to up grade to a bigger tank good luck
 
No. The ghost knife is extremely peaceful. The Oscar will harass the ghost knife to death. The pleco will probably also harass the ghost knife. These guys really do best by themselves.

Also, ghost knives can easily grow to 16-20 inches and would need more than a 75 gallon for themselves just because of their length. Your tank is stocked right now, theres no use looking into other fish.

Sarah, I believe its the African Black knives that prefer to be in groups. They are the only knife fish that can actually stand their own species as an adult. The rest of the knives like company while young, but as they mature they become intolerant of their own species.
 
Ghost Knife fish prefer to be in groups of 4 or more, so you should not add that fish. Your Pleco will grow to be VERY large, about a foot or so long, and your Red Oscar will soon outgrow the 75 gallon tank, as will your Pleco. For now, keep them both in there, but move the both of them to a 150 gallon tank for later on, if you can.
 
No. The ghost knife is extremely peaceful. The Oscar will harass the ghost knife to death. The pleco will probably also harass the ghost knife. These guys really do best by themselves.

Also, ghost knives can easily grow to 16-20 inches and would need more than a 75 gallon for themselves just because of their length. Your tank is stocked right now, theres no use looking into other fish.

Sarah, I believe its the African Black knives that prefer to be in groups. They are the only knife fish that can actually stand their own species as an adult. The rest of the knives like company while young, but as they mature they become intolerant of their own species.
 
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