04-08-2010, 07:24 PM
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fellow newb here ; )
check the stickies on this forum and other forums. They seem to answer the immediate questions.
Most of the forums advise against gravel or crushed coral for salt water (advising sand), and typically advise against any form of physical filtration (ie. undergravel, bioballs,or even a simple screen filter). Reason being is if you have one they want you to rinse it almost daily which very few people would actually do. Instead emphasis is placed on the natural filtration in your tank, and internal powerheads to assist. a protein skimmer may be the only thing you need hanging on the back, and those are more descretely narrow than a typical freshwater hang-on-back.