I'm thinking it would be bet to establish a food chain before you put in the bass. Those bass will make work work of the leeches and then you'll have small stunted bass. I might opt for smallmouth bass that likely won't breed as prolifically as largemouth. Maybe some pumpkinseed or sunfish that also is not too prolific to provide forage and some type of minnow or shiner first to provide a base. You have depth, maybe a few walleye and yellow perch to round it out.

I would not just add bass.