Boraras Brigittae (also known as Mosquito Rasbora), one of the smallest fishes I’ve ever kept. These are semi adult, slightly bigger than 1cm in size. The adults reaches roughly 1.5 to 2cm.
Don’t let the small size deceive you. They are very territorial and males are aggressive towards other males. Once they’ve established their territory they’ll defend it violently. One male will become dominant (the alpha) over the entire colony and will control roughly 50% of the tank while others will take the rest half. Its very fun to watch the alpha male defend his 50% space whenever others try to take a swim there!
This is a very rare-to-find fish in Bangladesh. I am probably one of the first few persons keeping this delicate species, still a lot to know. Hope they’ll live a long happy life!