Advice needed

Joined
3 Apr 2008
Posts
1,233
Reaction score
11
Location
Under the sea
So the four foot tank has been running for a couple of weeks now. Did some tests on the water last night and :huh:

Ph 8.3
Kh has dropped to 6-7 ???????
calcium 400
magnesium 900 ??????

can any body explain why my kh has dropped and how would I rectify this have dosed the local kh buffer after the test last night, and how do I get the magnesium up to the level it should be.
Oh yes connected my phosphate reactor on sunday with the seachem phosguard in as the media would this have any effect on the kh.
 
Last edited by a moderator:

Mike

Retired Moderator
Joined
12 May 2007
Posts
7,859
Reaction score
31
Location
the Motherland
We will need more info Pete, what is in the tank at the moment? what is your lighting period? what time of the day did you take these tests? what were the previous results? what temp are you running? how long has the tank been running?

It will give a background picture to the answers you seek.

i'm guessing that the mag has gone down because the kh is low, but all can be rectified easily once we have the answers to the above.
 
Joined
3 Apr 2008
Posts
1,233
Reaction score
11
Location
Under the sea
Hi Wee-Man the stock in the tank at the moment is

2 x clowns
1 x coral beauty
1 x royal gramma
1 x wrasse cant remember which one though

some zoos and mushies a pin cushion, candy cane some type of leather
+/- 25 - 30 kg live rock
Have got 4 T5 lamps in first 2 come on at 13:30 and off at 22:30 and then the front two come on at 14:00 and go off at 22:00

The tests were taken at about 17.30 yesterday afternoon and the previous tests were done on sunday afternoon and the Kh was on 9 magnesium was tested yesterday for the first time.

The chiller on the tank is set at 25 so it runs between 24 and 26.

Got the tank from a person that was leaveing the country and has been running for about a month now at my place, Did not clean out the sump when I got it so the sump was mature but would like to clean it out and change it a bit at a later stage.

Do a weekly 20l water change.
 

jacquesb

Retired Moderator
Joined
29 May 2007
Posts
17,868
Reaction score
72
Location
Cape Town
Pete - have you perhaps noticed corralline algae growth? Corals, as well as corralline algae can use up the alkalinity in the water, as well as the magnesium.

To increase the alkalinity, I would want to suggest start dosing with some sodium bicarbonate (baking soda), and/or sodium carbonate (washing soda)....

I dose epsom salts to increase magnesium, but this should be increased automatically when you do water changes.

Which brand of salt do you use, Pete? Have you changed salt brand perhaps?
 
Joined
3 Apr 2008
Posts
1,233
Reaction score
11
Location
Under the sea
The person I got the tank from was useing Tropic marine so I used up what was left of it and am back to the salt I always use real ocean
 
Joined
3 Apr 2008
Posts
1,233
Reaction score
11
Location
Under the sea
Mekaeel I have only been dosing the kh buffer(local product) to try and lift kh nothing else.
 

jacquesb

Retired Moderator
Joined
29 May 2007
Posts
17,868
Reaction score
72
Location
Cape Town
HHHhhhmm - clearly something in your tank is "using up" your magnesium and alkalinity.
Alkalinity USUALLY gets depleted when the pH is out of balance, and when there are huge pH swings in the tank (the alkalinity is partly there to ensure that the pH does not swing TOO much).
What exactly is the Alkalinity buffer that you are using? What does it contain?
Perhaps you should try to use Sodium Bicarbonate (baking SODA) for a while. And see if this helps with the alkalinity issue.
Once again, the magnesium should not be a problem, so I would not worry about that if I were you. Your magnesium should be replenished every time you do a water change.
 
Joined
28 Dec 2007
Posts
12,781
Reaction score
31
Location
JHB
Jacques, I am personally finding Kalk, far better at handling pH/Alk issues.

I have stop using BiCarb/baked Soda as with a CaRx high Alk is always my issues.
 

jacquesb

Retired Moderator
Joined
29 May 2007
Posts
17,868
Reaction score
72
Location
Cape Town
Warr - I still manually dose. I dose both sodium bicarb (once a week, on the weekend), as well as kalkwasser (nearly daily now - got a bit more corals and clams in the tank now that require more calcium)..... My alkalinity stays around 11 dKh, and my calcium levels between 420 and 460.....
 

Top