Thanks very much Bill. I have been reading a lot of your posts and I want to thank you for taking the time to help us amateurs. I would guess that seeing a white coffee cup wouldn't happen for more than 16 to 24", but I will not be able to check for a couple weeks. My plan is to find out the max depth for sure and to put the 2 defusers there.

Will this pump be too much for 2 diffusers? I don't want to stress the pump with too much back pressure.

Also, any tips on cleaning and maintaining the pump?

Thanks again!