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Old 06-08-2010, 11:17 PM   #61
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Just found this and guess what I added back in like Nov. guess where most of my cyano and green hair algae is growing? added 50lbs

"Rocks and substrate

Dead reef rock (also referred to as base rock), tufa rock, but also crushed coral substrate may contain serious amounts of phosphates. Some is bound very tight (pretty dissoluble minerals), some may be dissolved given the proper biochemical environment. If you want to know approximately how much soluble phosphate is contained in a specific rock or substrate, it is possible to test it in a bucket with heated and moved salt water for some days. Contents of 1 mg phosphate per kilogram of rock or crushed coral, and higher have been determined that way. A tank in which such rock is used will have high phosphate concentrations for a long time. If phosphate rich rock material is already in your system, there are two possible solutions: Take out the rocks, or increase the phosphate output of your system (see below).
The use of dead reef rock may be seen as one of the major sources of long term high phosphates in marine aquariums. If they are used they should be rinsed very well. Dead reef rock should also be scrubbed. Proper bleaching may be necessary to remove some of the more soluble phosphate containing agglomerations and minerals. Fresh and cured life rock, however, has a much lower phosphate content and should be preferred when setting up a new tank. "

by Marco Lichtenberger
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Old 06-09-2010, 03:55 PM   #62
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Ive got dry florida reef rock in my 20g and dont have any algae issues aside from brown whispy filmy algae that grows on the sides of my tank.

Matt
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Old 06-20-2010, 11:28 PM   #63
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dead rock isnt necessarily the same as base either, the base rock they are usually talking about is like if you take rock, and then let it sit out for awhile and die and then use it. otherwise the phospshate is bound naturaly in all suitable limestone/calcium carbonate rock, such as aragonite. Did you find lots of dead animals in the rock you added? Has it dissolved on you at all? If not you should be okay.
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