So I have a mono Argentus in my 55 tropical community tank... Before I catch all the criticism about its a brackish fish I now know, but I didnt know then and the LFS said that itd be fine in fresh (didnt know any better and its a stunning fish!). So I got it and put it in as my centerpiece fish instead of an angel fish and hes done great in the two months or so I have had him (he has grown an inch or so, very active, very peaceful with my other fish some of which are small, eats really really well, great colors etc). Now I really hate keeping a fish in an environment that isnt 100% ideal for them it really bothers me... I thought about setting up a second tank for JUST him but I read another post on here that they really need a huge tank and the 55 is my largest tank and I dont have the room for another one bigger (got 55, 2x 10gal, and a 4gal biorb lol) So I am at a loss at what to do. I want to keep him but what I am most concerned about is him not having the appropriate swimming room, even over being in the fresh vs brackish he is just so fast and swims back and forth against the back of my tank alot when hes not eating or begging for food whenever I walk by.. Ideas?