my fish had some fin rot that was being a pain so I added him into a QT tank. after maybe a week, ( the fin rot isn't gone, but has stopped growing further ) we noticed him making a bubble nest. the first day he was super proud of it, he kept making it bigger and bigger and parading all over the place. but a day or two later and he's totally stopped. the nest is dying away and he doesn't care, and he's just kinda sulking. if I come over he brightens up a little, but mostly he just sulks. is this because he didn't get a mate? is it normal? can I do anything to get the silly guy to cheer up again? or should I be worried? :/ he seems super glum, it's sortof worrying me and bumming me out a little, he looks so rejected and sad <T^T>;; do your males typically do this after making bubble nests?