So pretty soon I am going to be upgrading to a 125g (Yes I already have the tank). I am going to have a mixture of silver dollars (regular, wide bar, thing bar) and my polypterus. I want to put an active (at least one that doesn't hide) odd ball in the tank. I was originally thinking a royal knife, but with the silver dollars that too much silver and black. Any suggestions? I was thinking a tiger or zebra or ghost knife but was afraid they would hide too much. This tank will be upgraded, but no time soon so please take that into account with the suggestions. Thank you