I read your first and last 40 post's, gonna have to take a look at this thread when I have more time. Tank turned out real nice, can't wait to see it set up. On the tsn's, they should be ok. (Really it's all trial and error, with any lrg catfish, some work, some don't.) Like just stated the best way is to put them both in there at the same time, BUT if that is not do-able then I'd say make sure there is no decor in the temp. tank at all, nothing! I've found that my lrg'er cats fight a lot less when there is no territory to protect.