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Posted by David Hillyard on September 9, 2005, 11:21 am
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I have 1110 Mg & 350 Ca in a new tank. Can anyone shed any light on this
for me?
I have drained and cleaned a 240l planted freshwater tank thoroughly with
tap water. Left it to stand and dry for a few weeks in the garage and then
started to set it up as a marine system.
I filled it with (known good) RO water and added Tropic Marin Pro Reef to an
SG of 1.023 (a little low I know). I have allowed this to mix thoroughly
and age for 3 days and was about to add live rock but tested the water
first.
To my dismay the Magnesium and Calcium are much lower than I would expect.
The tank is completely bare except for 3 powerheads, protein skimmer, carbon
& rowaphos in an external filter and the heaterstat. Does anyone have an
explanation for this? The salt has been tested by my lfs and it seems OK.
If I do a 50% water change would this help?
David
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Posted by David Hillyard on September 9, 2005, 1:30 pm
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By the way, KH is 5, pH is 8.2, Nitrate is 10?! (there is nothing dying off
in the tank, its bare)
I didn't do anything to the RO before I added the salt other than aerate it
for 24 hours as I understand the Tropic Marin should buffer it OK.
Also, I would like to increase the SG to 1.025 as I'm sure this would also
help. What's the best way to calculate how much extra salt should be added
to the water?
---
>I have 1110 Mg & 350 Ca in a new tank. Can anyone shed any light on this
>for me?
>
> I have drained and cleaned a 240l planted freshwater tank thoroughly with
> tap water. Left it to stand and dry for a few weeks in the garage and
> then started to set it up as a marine system.
>
> I filled it with (known good) RO water and added Tropic Marin Pro Reef to
> an SG of 1.023 (a little low I know). I have allowed this to mix
> thoroughly and age for 3 days and was about to add live rock but tested
> the water first.
>
> To my dismay the Magnesium and Calcium are much lower than I would expect.
> The tank is completely bare except for 3 powerheads, protein skimmer,
> carbon & rowaphos in an external filter and the heaterstat. Does anyone
> have an explanation for this? The salt has been tested by my lfs and it
> seems OK.
>
> If I do a 50% water change would this help?
>
> David
>
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Posted by GrimReaper on September 9, 2005, 4:52 pm
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I do this to calculate the amount of salt to add to increase the SG by 0.0x
Desired SG = 1.25 SG (About 34 Parts Per Thousand)
Current SG = 1.023 (About 31 Parts Per Thousand)
Difference = 3 ppt
Volume of water in tank = Say 200L (You will need to know this)
Therefore each litre of tank water needs 3 gms more (Difference)
so 3 gms x 200 Litres = 600 gms
That's it
GrimReaper
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Posted by David Hillyard on September 9, 2005, 5:56 pm
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Thanks for the advice. I have now added the extra salt and the SG is up to
1.025.
Ca is now 375, Mg 1170.
My lfs tested a small amount of my salt in RO in case I had a bad batch but
the Ca and Mg readings were a lot higher for him. The test kits I'm using
are brand new and not contaminated. LFS has confirmed my low readings are
accurate.
Having done a little research on the web it seems others have had a similar
experience. I have no substrate at this stage but my lfs doesn't think that
would make any difference anyway.
Would it be a mistake to add live rock with low readings and would it be OK
to add magnesium to bring the levels up or would this cause more problems
later?
Any help is greatfully received, so thanks to GrimReaper.
---
>I do this to calculate the amount of salt to add to increase the SG by
>0.0x
>
> Desired SG = 1.25 SG (About 34 Parts Per Thousand)
> Current SG = 1.023 (About 31 Parts Per Thousand)
>
> Difference = 3 ppt
>
> Volume of water in tank = Say 200L (You will need to know this)
>
> Therefore each litre of tank water needs 3 gms more (Difference)
> so 3 gms x 200 Litres = 600 gms
>
> That's it
>
> GrimReaper
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Posted by GrimReaper on September 10, 2005, 3:16 am
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David
I'm not a "Reef" tank expert as such but I would imagine that live rock
would be similar to adding any live animal. You must equalise their
conditions slowly
Regards
GrinReaper
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>for me?
>
> I have drained and cleaned a 240l planted freshwater tank thoroughly with
> tap water. Left it to stand and dry for a few weeks in the garage and
> then started to set it up as a marine system.
>
> I filled it with (known good) RO water and added Tropic Marin Pro Reef to
> an SG of 1.023 (a little low I know). I have allowed this to mix
> thoroughly and age for 3 days and was about to add live rock but tested
> the water first.
>
> To my dismay the Magnesium and Calcium are much lower than I would expect.
> The tank is completely bare except for 3 powerheads, protein skimmer,
> carbon & rowaphos in an external filter and the heaterstat. Does anyone
> have an explanation for this? The salt has been tested by my lfs and it
> seems OK.
>
> If I do a 50% water change would this help?
>
> David
>