What do you guys think about a single angelfish in a 16 gal bowfront tank? 20" long, 18" tall, 9 inches front to back at the shortest spot and 13" in the longest. It would be a heavily planted tank with a small group of corydoras for bottom feeders. I was originally thinking of getting a pair but I'm not sure they would have enough space. So what about just one? Water changes are done every week.