Wow, quite a powerful filter. I think I'd agree with you then, that you'll have to put something on it to keep his fins from getting swallowed up and torn.
If you don't have anything right now to control the suction on your filter, he'll be alright without it for a while.
Out of curiosity, how often will you do water changes? Most users on the site reccommend something like this:
Mo 100% wc
We 50% wc
Fr 100% wc
It alternates as shown. Maybe that's for 1g tanks, but someone else can help with that, too. In any case, that wouldn't be too many water changes.
Can't wait to see what he looks like. It sounds like you absolutely adore him. :)