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That's exactly what it is, and is normal. I wouldn't be surprised if the old alpha is ejected from the school, which is the beginning of a long slow death. That's been my experience with them.
125 - BGK, pictus cats, silver dollars, kissing gouramis, palmas bichir, delhezi bichir
125 - Red severum, bolivian rams, Turquoise rainbows, irian red rainbows, loaches (angelicus, zebra, kuhli and horseface), plecos (BN, RL and clown), denison barbs, pearl gouramis
90 - Congo tetras, african knife, elephant nose, spotted ctenopoma, upside down cats
QTs - 29, 20H, 20L, 10