neon gourami

So I just found my neon gourami dead. I've had him for a while, in a 29 gallon with 4 small angel fish, 6 blood fin tetra, beta pallifina, female betta, 3 Khuli loaches and 2 snails. Not sure why, he showed no signs of being sick. He was eating in front of my probably 2 hours earlier as well. He...