@smirffylover189, it depended on the fish. Some built theirs the night I brought them home, others waited for a few weeks. Sometimes they will build 4 huge ones in a row, and then stop building them for a while. It just depends!
@iamtetsuo, I swear your fish is Chance's twin! He's so awesome!
@diruak, thank you! I love him, he's such a silly fish. Very, very active and show-offy.
@everyone else! Thanks! I always feel warm and fuzzy when I see they build big ones, it makes me feel like I'm doing something right. :]