Thanks! The fish are quite small although grown a lot since I got them. Probably about 5" long. I thought it would be best to start out with .19 goldfish until I knew how things were gonna go. Now my granddaughter has named them all & I've gotten attached to them. lol

I'm wondering about the waterfall too because when I stand behind it I can hear water...more I think than just what's going through the tubing. Not sure how I can check it other than dismantling the rocks one by one around it & replacing hem very very carefully.