yes you need to keep the leaves clean so it can expell the salt from the roots taking out the nutrients in the water. and make sure that the leaves are dead to take them and not let the leaves go back into the water. I took a dead leave and put it in a container of water and left it for a few days and measured the nitrates and phoshates and it was a freakin lot. so it does work.....
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180 starfire front, LPS, millipora
Doesn't matter how much you have been reading until you take the plunge.
You don't know as much as you think.
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