if they're fired, it's kinds sealed up right. Other kind may hurt them, you'd have to dry it, and seal it up with silicone. Eithor way, I think the style of the one you did was great. You could also do one with a hose and make a little fall. Maybe others would want a viv like yours and you'd be in buisness..

My vivs all have something that looks like it does/doesn't belong. A big marble sphere in one, and a marano glass ashtray in another. So I like having something different, where I think all vivs start to look the same after a while, or atleast after 1,000 pictures.