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Old 02-06-2007, 12:37 AM   #1 (permalink)
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Default Onyx Sand

Is Onyx Sand a regular aquarium plant substrate just like Flourite? I am using Flourite right now but want to switch to a darker substrate and want to stick with Seachem as the Flourite works so great. Does the Onyx Sand have the same properties as Flourite, such as can be used for the long term and won't dissolve over time in the water?
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Old 02-12-2007, 08:19 AM   #2 (permalink)
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Onyx Sand can be used for a long time and does not need to be replace. It will offer the same benefits as Flourite, but has a slight buffering capacity.
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Old 02-14-2007, 07:15 AM   #3 (permalink)
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What pH does Onyx buffer to?
Never mind
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Onyx Sand™ is not chemically coated or treated but does have a slight buffering capacity that may raise pH by 0.1 - 0.5 pH units
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Old 02-14-2007, 07:25 AM   #4 (permalink)
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Onyx sand can raise pH by .1 to .05 units. It can buffer DI water that has no buffering capacity what so ever to 7.2-7.4.
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Old 09-13-2007, 04:32 AM   #5 (permalink)
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Default Re: Onyx Sand

I would like to revisit the Onyx Buffering issue.

I currently Set up a New 90Gallon FW tank, 7 months in the making. Carefully chose my Rocks, and Wood.
Kept with the same Substrate base of Fluorite, but added Onyx Sand for a Lagoon Type center view for HC and Baby tears, and Clover.

I use RO/DI Water 50% weekly water changes. The RO/DI water in the vat is At a GH of 2 and a KH of 4

After two Days in the tank my water is at A GH of 12 KH of 4. My 55 holds steady at 4 and 4 Respectively, the only thing different between the two tanks are the Onyx Sand.

It seems no matter what i do I can not keep the water Softer in the 90, Its easy enough to buffer the 55 to what I need, at 8dKh but this 90 is costing me endless hrs of headaches

Am I overlooking Something Here??

As of this morning my parameters were:

KH 4
GH 12
PO .25
FE .1 cant seem to get the iron content up in the water coulum as well either
Nh3 0
No2 0
No3 10
Ph 6.6 looking for 6.2 nominal
Temp 25.8c 78.4f nominal setting of 26.3c when the lights are on

Guess i am going to have to do bi weekly water changes to keep everything stable, My Fauna seem to be ok with it for now, but I see problems that may arise down the road with me having to replace Co2 cylinders every 6 months.
Running at least 6bps to hold 6.4 during the mid afternoon Photo period, I utilize a power vortex reactor to supply the Co2. thats located 2" from the bottom of the tank.

Somehow I believe that the Hardness is being effected by the Onyx, Maybe you can shed some light on these findings I have seen.

My Main goal is to get the Ph stabilized down to 6.2. Not a chemist here as you can see, but i believe the hardness has a lot to do with the breakdown of the Co2 Not???

Thanks for any help you can shed on this.
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Old 09-17-2007, 07:28 AM   #6 (permalink)
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Default Re: Onyx Sand

If you are trying to maintain low pH and Gh Onyx Sand is not the best gravel for that. It does buffer the water raising pH to about 7.2-7.4. This works well creating a stable environment for many tanks, but these are not the parameters you are looking for. Onyx Sand has a elevated calcium and magnesium. All of these parameters are stated and available on the website. The elevated levels of calcium and magnesium will not interrupt the ability of your plants to use CO2.
We have other substrates that are dark that do not effect pH or GH. Flourite Dark, Flourite Black, and Flourite Black Sand.
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Old 09-18-2007, 09:01 PM   #7 (permalink)
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Default Re: Onyx Sand

Please tell me where I can get these gravels you mentioned. I do not see them on your site.

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Old 09-19-2007, 06:10 AM   #8 (permalink)
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Default Re: Onyx Sand

The gravels are new and are not up on the page yet. Quite a few online vendors have picked it up and in another recent post on this forum someone has posted a couple of online stores. http://www.aquaticplantcentral.com/f...e-black-2.html
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Old 09-20-2007, 04:08 AM   #9 (permalink)
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Default Re: Onyx Sand

Quote:
Originally Posted by Seachem View Post
If you are trying to maintain low pH and Gh Onyx Sand is not the best gravel for that. It does buffer the water raising pH to about 7.2-7.4. This works well creating a stable environment for many tanks, but these are not the parameters you are looking for. Onyx Sand has a elevated calcium and magnesium. All of these parameters are stated and available on the website. The elevated levels of calcium and magnesium will not interrupt the ability of your plants to use CO2.
We have other substrates that are dark that do not effect pH or GH. Flourite Dark, Flourite Black, and Flourite Black Sand.

Guess I should of Dug around a tad more prior to adding it, I understood it would buffer it, but not by that much
I can not complain though, Even though the water is a tad Hard, 12-13 dkh, My Crypts have adjusted to it, and it does not seem to have had any ill effect on my Fauna, Black Tetra's and Swords.

I guess if I get tired of the baby tears, which are growing in it, I can always turn to the Black, I really like the products but that darn GH really is getting the best of me

Thanks for the reply, and I will be sure to ask more questions next time prior to worrying about anesthetics
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Old 09-20-2007, 06:44 AM   #10 (permalink)
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Default Re: Onyx Sand

You can always go to the website and look at the specks for the planted substrates. For most Onyx Sand is a great now worry substrate it holds a lot of nutrients and will help maintain pH between 7.2-7.4. If you are describing dKH-Onyx Sand does not heavily impact GH or KH it can raise it some.
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