I'm always reading how mildly aggressive Yellow Labs are and how normally in tanks they are low in rankings when it comes to being the dominant fish in a mix Mbuna tank. Well about a few days ago I notice my obvious dominant Albino Zebra acting a little weird and he was swimming around letting all the fish nibble at him which is weird because they never run into him on purpose so i placed him in the 10 gal hospital tank to just focus on him. Instantly all the fish swam to the surface just floating about like as if they're waiting for food, and I had also just got some new Red Zebras to balance out the amount of Zebras in the tank along with 3 Turquoise Jewels. While letting the bag float for about 30 minutes i added the new fish slowly and carefully by adding the tank water to the bag little by little. As soon as the fish hit the tank my biggest Yellow Lab brighten up drastically looking real highlighter yellow and the vertical black strip on his eyes grew dark and bold as he went about chasing all the fish within the tank. The Johanni was also next up (sort of speak) for the dominant position so he and the Yellow Lab started circling each other. I actually thought my Lab "Sneaky" was just putting up a front until he took the first bite at the Johanni and didn't have any intentions on letting up. The scuffle ended with the Johanni folding its fins and heading into the rocks as Sneaky chased em. And as of now his color flares beautifully throughout the whole tank as he is constantly chasing every fish in his direction, even the bigger newer Red Zebras. When I added the Albino Zebra "Boss" he looked about normal and began chasing the other fishes and I guess from previous experience "Sneaky" kind of like avoids "Boss" but doesn't really submit and now the Johanni tries and challenges Boss way more often than before as well as other tank mates. Has my Yellow Lab "Sneaky" officially become the dominant Mbuna in the tank? And will my previous dominant Albino Zebra "Boss" reclaim the tank as dominant male fish?