Well, I introduce him and he goes and hides behind one of my filters. No big deal; I figure I'll check on him in a few hours and see how he fares. If he's still hiding from everything, I'd take him out and put him back in his 5-gallon tank.
...
a few hours later, I can't find him, but oddly, my clowns are all gathered behind the plants somewhere. I go and see what the fuss is all about and there I find the skeleton of my betta.

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Now that I've written this, I guess part of this is just to vent, but I feel horribly guilty. What the heck?
My clowns were only 1" to 2", and my betta was easily 3/4's the size of my biggest clown. What happened? Was I negligent in introducing a betta to the aquarium? How are my other fish surviving in there unharmed if my betta got torn to shreds in a matter of hours?
:CRY: my poor betta. I didn't mean to get him murdered by introducing him into the big tank...
Any input from y'all would be greatly appreciated. Thanks...
I feel terrible.