What size is your tank?
Definetly prefilter it. If you can't find one at your LFS, they have them here: http://www.amazon.com/s/ref=nb_sb_no...efilter+sponge
It will only slow down the flow a little bit, but it will keep him safe from getting sucked into the tube.
For a baffle I use a very porous sponge.. I think the one I'm using is a fluval chii pad.. and a silicon band (some people use rubber bands.. I work with kids so I have those silly band things laying around..) to keep the sponge over the outflow. As long as it's still making bubbles under the water it's ok and not too baffled.
Also the higher the water level the less current it will produce. Only leave it about an inch from the top.. starting right about the black lip
If you still don't end up liking it, I really like my Aquaclear 20 and my boy goes right into the downflow and doesn't bat an eye.. though I think he might be a particular good swimmer.