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There are thousands of species of macro-algae. Here a few sample species: http://www.reefs.org/hhfaq/pages/picture_pages/faq_sargassum.html http://www.reefs.org/hhfaq/pages/picture_pages/faq_halimeda.html http://www.reefs.org/hhfaq/pages/picture_pages/faq_caulerpa.html...

A 5 lb bottle should last you more then 6 months. The bigger the bottle, the more time in between refills.

Try www.marinedepot.com. I'm sure any mail order vendor that carries CSL products can provide you with this bulb.

You've got lots of choices, and it ultimately depends on your budget. It's better if you list options you're considering or a price range.

I've updated my website with a different look, more pictures, and soon, more content. If you have the time and bandwidth (graphics intensive), take a look. www.reefscapes.net

You can't. For Naso sp., at about 4", you may start seeing dimorphism between males/females, but not before.