Hello, I am thinking of purchasing 6 Royal Whiptail Catfish from my LFS and placing them in my 4ft 350L tank with 3 medium Angelfish, a Black Ghost Knife, 2 Blue Rams, 6 peppered corydoras and 5 head and tail light tetras. My tank is in good condition with good water quality and I am not new to fish keeping. My tank has plenty of drift wood and plants and has algae growing on the side and back of the tank that the fish might like to eat. My problem is that the fish are expensive, and a group of six would cost me $150 and I have heard that they are moderately difficult to keep. I do not want them to die and if anyone has any personal opinions on these fish and their care or any advice I would appreciate it greatly. Thank you very much.