Quote:
Originally Posted by MarkoD
They might be low because the algae has absorbed them. And then when it startts dying off, won't it release everything back?
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I would agree. Without a nitrate sink like bioPellets or zeo or some such thing, the nitrates are being efficiently consumed by macro algaes in the tank thus giving you that zero or low reading. What you then have to do is harvest that algae or get something to eat it. I guess it's sort of like having a refugium in your display tank? :-)
Now having said that, it was suggested here and I've heard/read many times that you don't necessarily want your nitrates and phosphates to be zero. Various organisms need some level of these nutrients.