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Onyx Experience and Opinions Wanted
As a long time lurker of the list, I would first like to extend my thanks to those on the
list here for being such a wonderful resource ....
I have a 75g tank, fairly heavily planted with 160W of flourescent lighting, DIY CO2,
and a gravel substrate that is much too large (the gravel diameter is very large,
leaving too many places for decaying matter as well as making the planting of stem
plants a real chore). This tank has been going through cycle after cycle of BGA
outbreaks as well (eight months and counting), and I have had enough :-) Because
this tank is in poorer shape than my other three tanks, I have decided now would be
an excellent time to get rid of my problematic substrate. I have sand substrates in
my other three tanks (pool filter sand with nylons filled with peat moss underneath)
and I really like the ease when doing water changes. For this reason, the SeaChem
Onyx sand looks like a no-brainer for this tank, but I have seen such wildly differing
opinions on it, I was hoping those here on the last that have tried it might have
some input. I know Tom Barr likes it, and that is enough to convince me 99%, but
other inputs would be most appreciated as well. Of particular concern to me is that
the literature speaks of a "slight buffering effect", and as I only use DIY CO2 I am
hoping to not raise the pH much over what my tanks tend to run at normally
(pH=7.4, KH=3, GH=10).
Also, if there are any tips on washing/preparing the Onyx before placing it in the
tank, that would be a great help as well.
Much thanks in advance,