hi everyone, I am new here and need some advice....
I currently have 2 jack dempsey cichlids about 1 1/2" in length, and 2 convict cichlids about the same size. Is there anyway I could add a blackghost knife fish into the tank as long as it has plenty of places to hid out

?? I only have a 29 gal now but once the fish start getting bigger I plan on getting a rather large tank. I have gotten those fish several weeks ago and was planning on just doing cichlids but the other day i went to the pet store and saw a black ghost and feel totally in love with them and would really like to have one.
Thanks