Jeff, I believe you are right. I just heard it woop really loud.... I think it was telling me it was feeding time. I always feed at the same time and, today I was 15 minutes late. lol I came up to the cage and 7 little faces with fat bodies were all lined up at the side of the tank waiting for me. It was quite comical

I got your PM. Ill get back to you soon.

Cheers Big Ears