Bubba said:I am sorry, I will have to disagree with that.
I have had my ghost knife for 16 months plus in a 33 gallon tank and he is going great. He is about....maybe 7-8 inches and does well and has plenty of space, so I think that a 55 gallon tank will be perfectly fine. True, it will get to 20 inches, but it will take a LONG time for that to occur and for most people it isn't common for it to get that big.
sorry bubba but i have to disagree with you.. i think a 33 gallon tank is small for a ghost knife... while it may appear that its growth is slow, it is probably because its gwoth is already being stunted, only my opinion though... i think the fish will only live a fraction of its average lifespan in a tank that's not too big enough for it