Greg there are so many ways to approach this topic that it's a hard one to start. Probably the best thing to do is get a piece of paper and write down some ideas about what some of the features you would like your canopy to have.
Once that's done then maybe head on to
www.reefcentral.com
and do a search on canopy, hood....something like that and you will find too much reading and viewing material.
hope that helps you.
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No matter what the morrow brings, inventors keep inventing things.
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Jonathan
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www.cakerybakery.ca