Crab Bisque

I'm not just making muffins from a box... today I also made a Crab Bisque. No pic (let's face it - soup is not generally photogenic) but it tasted really very good. Went lighter on the cream than the recipe calls for (lower calorie motivations) and substitute maizena (corn starch) for the rice flour to thicken it; maybe agar-agar would have been a good idea?