Yes I think most of them are. Some might be reflections. I found 3 dead total over 1 week.
On a different subject. I had to siphon the tank twice already because I had trouble with the food. At first I siphoned 1-3 every now and then. Luckily tpocicat told me to put a. piece of pantyhose on it. It worked great. Ty tpocicat.