I am planning to add a polypterus to my tank and I have two LFS that have some. One has a few Palmas and the other has a Senegal. I am new to these fish so I was wondering what is the difference other than apperance? Is the care level between the two any different? What about maximum size or activity level? The Palmas is about $13 more than the Senegal, would it be worth the extra money? Any information will be appreciated.