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Old 09-12-2011, 04:00 AM
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Websites are great for opinion but poor for facts. Put your faith in books written by scientists and industry experts.

"There is a similar range for acceptable salinity, but it is a narrow band, around 35 to 36 parts per thousand (ppt). At normal reef temperatures temperatures, this is a specific gravity of about 1.025 - 1.026."

p15 Marine Invertebrates by Ronald L. Shimek, PH. D. 2004

This must be the light? http://www.aquaticlife.com/products/286#1 I don't think I've ever seen 18" HO T5 bulbs for sale before. Does Big Als sell replacement bulbs in their store? I don't see them on their site. The recommended replacement schedule for T5s is up to every 6 months I believe. I personally don't follow that with my own fixture but I'm sure some people do.

Is your 20gal only 20" long?
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