So my tail-less betta Reef who has the least reason to be happy, decided to grace the front of his critter keeper with a BIG bubblenest today! He's the only one who ever built me a bubblenest too. My other spoiled brats never blow me a bubblenest! His regrowth looks great too! Funny thing though, when I first got him from walmart he was in a small vase with 1/2 gallon bc thats all I had but he was making nests in there too. He made his first nest on day two of treatment in the 1/2 gallon but in the 1 gallon it took him 1.5 weeks to get used to it enough to eat. Maybe he likes smaller spaces?