if you can find the malachete green(sp) that used to be sold for ich cure
you could use a concentrated batch in a lil water in a container and soak your new tubing in it, the blue/green it will stain the tubing blends in alot better with plants and backgrounds
i have one bubble wall that i love the look of, i got it at walmart, its made of a soft black foam like material, had it for years and its never clogged or deteriorated, and it makes an absolutly stunning wall of fine mist like bubbles that cause no noise of surface splash, this one is flexable and can be bent into any shape desired as well