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The nitrates should definitely drop as the matter is removed from the actual water column. Water changes will help a lot too to lower them.
As far as how often to do it, I'm not sure. What I normally do, and I have no idea if I'm right, is I do it once a week and then wait for all the "floaters" in the water to dissapate and then clean the filters out. If it looks like I need to do it more than once a week, then I'll do it as needed. But, as a rule of thumb, I go with once a week to play safe.
Also, maybe you can direct a power head towards the rocks? This may help to keep the stuff from settling on there.
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Eric
2 green chromis
2 false perc/tr
Indigo Dotty/tr
2 button polyp
gsp
candy cane
zoa
ricordia rock
open brain
5 turbos
5 hermits
30 lb ls / 27lb lr
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