I have a 29gal growout tank that only has a 4" sen in it at the moment. My 4.5" (and rapidly growing) oscar was sharing the tank with him until last night when I moved the O to my 240gal. This was always the plan as I never intended to keep the O in the 29 long-term. It is the first bichir I have ever owned (actually the bichir is my 3yo daughter's and the O is my 6yo son's). I did not appreciate how slowly the bichir grows in relation to the O, and I didn't want the sen to get eaten. I also recently got my first dat (2.5") and put it in the 240. It is also a slow grower. So, could I put the dat in the 29 with the sen? Are their growth rates pretty evenly matched? They seem to be. Will having just those two fish in that 29 slow their growth even more? I know it is not the ideal growout tank. I don't want the dat to get eaten y the O as it gets larger either. I have options available to me if I need to get rid of one or the other (but not the O or sen- they're my kids'). Which scenario would work best for all fish involved?