| Flourite | Onyx |
It doesn't affect water chemistry.
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Buffers the water, raising GH, KH, and pH. This can be a valuable advantage if you have very soft water, or if you use
a Carbo-Plus, which depletes the KH of the water and can cause pH crashes. OTOH, it can be a real pain if you want soft, acid water.
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It's quite attractive - a very natural-looking mix of red, brown, tan gravel.
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It's also very attractive, and many people prefer the dark gray color to Flourite's brown.
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It's easier to set up and plant than Onyx, because it's not as fine and messy.
The larger grains hold down the plants better.
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The finer, sand-like texture is great for both delicate plant roots and
bottom-dwelling fish. Once everything is planted, the sand texture is easier
to handle than the relatively coarse Flourite gravel. Fish like catfish and loaches love it.
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NOTES: Flourite now comes in two different colors: original and red. The red Flourite is very red.
It's not as natural-looking or as pretty as regular Flourite, IMO.
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NOTES: Onyx comes in two textures, Sand and Gravel. I much prefer the sand. The gravel is too coarse - even coarser than Flourite.
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