Quote:
Originally Posted by Fade2White12
Even if this was true (which I'm doubting), running some GAC would effectively export Al due to its attraction to organics. Coupled with routine water changes, this should be a non-issue. If I cared about Al (which should be much lower on people's priority list than the introduction of much more toxic metals and substances), I'd be more worried about supplements and salt mix.
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What experience do you have with aluminum to claim that? Many people have experienced problems, even if you think it unimportant. Many less so now, however, since GFO has replaced aluminum oxide binders in many people's aquaria.
Heavy skimming does not seem to prevent elevated aluminum. I don't think it is as simple as using GAC to decrease aluminum, but I do agree that there may be other metals that are also a concern. I worry about them too!
In most cases to date, people do not know the source of these other metals, so do not make the immediate connection they make to adding something like Phosguard and seeing corals close up that same day. So it isn't as easy to demonstrate what the other metals might be doing.
FWIW, the Triton folks seem to recommend swapping back and forth between GFO and aluminum oxide binders, in part because the GFO will bind some aluminum.