I believe it blew up in reaction to being placed in a new environment, not necessarily a negative or positive reaction. Bubble tips or no bubble tips is not an indication of hunger, no one really knows for sure (plenty of anecdotal opinions, including my own) why some exhibit the bubble behavior in some tanks and not in others. I only mention this not to stir the pot, but just to make sure you don't feed and feed and feed assuming that if it is "stringy" it requires food.