I had 5 zebra danios and 1 pearl danio in my 10 gallon tank. This morning when I woke up (haven't been near the tank for about a day) I saw that there was 1 zebra missing from the tank. I looked all over the tank, the filter, outside the tank, and under anything where it could be caught and there was no sign of it at all. Was it possible that the other 5 danios made a meal of him over night?