The galaxy koi is small so he is probably just 3-4 months old same with the rosetail. My giant betta had unfortunately passed while I was at work, moved him to a small quarantine tank to watch him closely.
I gotten two Halfmoon dragon bettas, a red and a black marble. I also decided to swap gravel to fluorite black sand(finely ground clay). Tank is a bit cloudy and there’s a layer of dust on the sand and plants now but I’ll do another water change in a few days.