they are channa marulioides (emperor snakeheads)...
i keep these for a number of reasons... 1. I like the way they look
2. I like their mid-range size (26 inch max)
3. I like the fact that they r not very aggressive like other species and thus can be kept with other fish...
most fish yawn near in the evening like before the lights go out... im not sure why...
channas do get some monster teeth but I dont think these get as crazy as the more common snakeheads... but we shall see these are still quite small... the teeth are there though they just aint very big yet...