Ive had this 4 1/2 inch french angel for about a month now and its been healthy and eating great ever since day one. Last night when I fed, he was great, eating and swimming around. 2 hours later right before I went to bed, he was laying on his side breathing heavy. I watched him for a while and saw him "throw up" some pellets I had fed him. woke up this morning and it was dead. Does anyone know what could have caused something like this?