lol hey there! haha i posted a thread on these just a couple topics down and didn't get any replies.... I've been researching these as well because they seem to be like a great substitute for a black ghost knifes but for us keepers who don't have a 125 gallon tank. Obviously i don't own one, but am planning on getting one as soon as the 55 gallon is set up! So i might be able to help you with what ive read and talked to people about so far.
So far Ive learned that in general care its pretty much the same as the Black ghost knife in terms of water conditions and temp and feeding.
The main difference between the two is that the brown ghost knife only gets to be about 10" max where as the black ghost knife..is much greater at 20 ish" lol