I bought a longnose butterfly last week, and he is doing great. He didn't hide after acclimation, and ate first time I fed him. He eats bloodworms and Formula 1 ravenously, but tends to spit flakes out. I have heard that they are the best butterfly for a beginner, and that they require a little bit of extra attention. I think the latter is further from the truth. I posted about one recently, and I think Pufferlover(not sure) used one to cycle his tank, but his died suddenly aftera few years.