06-15-2012, 11:43 AM
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Yes. Some gravels will raise pH, and/or GH, so if it is an "aquarium" gravel always carefully read the bag information. A while back i bought some quite nice fine black gravel only to find out it raises pH (but not GH, which was interesting).
No mention is made of intended fish, but the warning about sharpness is critical if substrate fish are intended. Eco-complete and Flourite (I have the latter, and have seen the former in stores) are rough and not advisable with substrate fish, I had to remove my corys from the Flourite tank.
I've not tried the specific gravels you mention in post #1. But on pool filter sand, if you can get the black, it is fine; the white is too bright in my view. For years I had fine gravel, the natural buff-blend, until I decided to change over (last 2 years). I now have Quikrete Play Sand in five tanks, Flourite in one, and fine dark gravel in the other. The Flourite is likely to get changed to sand this summer, it has been very disappointing. And the gravel may soon follow. I obviously like the sand.