brownish alge on live rock

it is perfeclty natural in new tanks. it will go away assuming that you do not have silicates and other nutrients in your tank. to get rid of those, make sure youa re using RO or DI water instead of tap water and that your sand is not silicate based.
 
I am using DI water to top off and have crushed coral. Is there a way to test for any of these nutrients or silicates? My LFS told me to use hermit crabs and snails and that would help some. Should I clean any of the rock off or just let it run its course? Thanks for the help!
 
My tank is about 2 months old and I'm just now going through the same thing. Its not gotten out of hand, but its there! After doing lots of research, and getting plenty of opinions here on the forums, I've found that its a normal process that a new tank will go through at some point. You can reduce the likelihood of its occurrence, like fishieness pointed out, by using by using RO/DI water, and staying away from sand that might contain silicate in it.

I don't know of a way to test if the sand has silicates in it. But going with the frequently used brands of marine sand should be safe.

Cheers!
Yash
 
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