Onyx sand? Flourite? Flourite Red!? Help! - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 10-15-2007, 05:07 PM Thread Starter
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Question Onyx sand? Flourite? Flourite Red!? Help!

hi all,

i just recieved two 24"x18"x18" AGA from my friend. was thinking of setting up another 2 planted aquarias in addition to my present 190l and 50l planted.

I've been using AS amazonia and africana, might even try malaya and amazonia 2 together. But the onyx sand and flourite from seachem at my LFS kinda caught my attention too.

has anyone used onyx sand or flourite from seachem before? whats it like and how do i get the best out of it?

i read the seachem website and it says they are best used alone. is this true?

information please! thank you =D
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post #2 of 6 (permalink) Old 10-15-2007, 05:22 PM
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Onyx = inert. It's nice, but doesn't have any supplemental nutrients to help your plants grow.

Flourite...the regular Flourite (not black) is OK in my opinion. I don't much like the color and the grain size is a tad too large for my tastes.
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post #3 of 6 (permalink) Old 10-15-2007, 05:56 PM
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Onyx has somewhat high calcium (bicarbonate) and magnesium levels. It will buffer the water some.

Onyx and Gray Coast Calcite are the exact same product, but they're packaged differently. Someone at Seachem told me this. The GCC is usually cheaper in my area and it comes in a 10 kg bag vs. a 7 kg bag for the Onyx. You can compare the elemental contents of each and see that they are practically the same.

Concentration of nutrients in Onyx Sand™
Aluminum 822
Barium 5
Calcium 197500
Cobalt 4
Chromium 10
Copper 4
Iron 2846
Potassium 417
Magnesium 115400
Manganese 43
Sodium 135
Nickel 7
Vanadium 8
Zinc 23

Units=mg/kg, source: Plasma Emission Spectrometer, EPA Method 3050, Univ. of Georgia Chemical Analysis Lab

Elemental Concentrations in Gray Coast™
Calcium 197,500
Cobalt 4
Iron 2876
Potassium 417
Magnesium 115400
Manganese 43
Molybdenum 6
Strontium 63
Vanadium 7
Zinc 23

Units=ppm, source: Plasma Emission Spectrometer, EPA Method 3050, Univ. of Georgia Chemical Analysis Lab


Onyx: http://www.seachem.com/products/prod...yx%20Sand.html
Gray Coast Calcite: http://www.seachem.com/products/prod...GrayCoast.html

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post #4 of 6 (permalink) Old 10-15-2007, 07:20 PM
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If you really like the Flourite series, go with Flourite Black, that will give you a good contrast. Flourite Black Sand is the same except it is finner grain. Both are good substrates.
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post #5 of 6 (permalink) Old 10-16-2007, 03:37 PM Thread Starter
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hmm. thanks for the input! so im assuming that if i use flourite or onyx. i could use it as the only substrate without adding another nutrient base?
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post #6 of 6 (permalink) Old 10-16-2007, 04:57 PM
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No, you will still need to dose fertilizers in the water column with any commercial substrate.

Quote:
Originally Posted by iridescencet View Post
hmm. thanks for the input! so im assuming that if i use flourite or onyx. i could use it as the only substrate without adding another nutrient base?


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