Thanks guys for the advice. Robmcd, you think Dat's are trendy?? oh noes! lol..
Well me being impulsive, I went ahead and bought the Dat last night on the way home.. When I got him home I realized that he just MIGHT be big enough to eat my pike. so after a few hours of worriedly watching him in the tank, I decided better safe than sorry and outfitted his own 20g holding tank (previously housing feeders... which are all in the dat's belly now lol).
My plan is to either (a) hold him in the 20g for a few weeks til the pike grows some more, (b) get him his own tank, or (c) return him from whence he came! In the meantime, I'm going to scour the Datnoid forum for info.
I will post pics of the SA tank by the way, I'm really happy with it... got some alumni event tonight, so will have to happen on the weekend.