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Sam, is your tubing 1/4 inch OD or ID? If it's OD, what is the ID? The tube I'm thinking of using is black garden sprinkler material (I think it may be polypropylene), with an OD of about 1/4 inch but only about 5/32 inch (4mm) ID.
One other question: I have a bag of coral rubble, ranging between pea size and pieces about one inch long and 1/4 inch thick. I can easily go out and buy plastic media, but I'm wondering if one may be more effective
Les
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