Gh mg v's ca - The Planted Tank Forum
 
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post #1 of 15 (permalink) Old 07-31-2012, 07:06 PM Thread Starter
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Gh mg v's ca

Hello

I've just tested the general hardness of my water.

The results are:-

Aquarium 260ppm
Tap water 140 ppm

I add mg in the form of mgs04
5 tsp in 400ltrs 3 times a week.

Firstly I'm wondering if I actually need to.
I know it's no biggie if I don't need to but if I don't I figure why?!

Based on my results how likely is there to be sufficient mg and ca without adding anything?
Or is a test kit the only option?
I don't particularly want to buy a 20 test kit to use once!

I've looked on my local water suppliers website for my area and everything is listed except mg and ca!!!

Any advice please?


Cheers

Mark
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post #2 of 15 (permalink) Old 07-31-2012, 07:08 PM Thread Starter
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Here is my analysis for MY area.


1,2 dichloroethane 3.00 8 100% 0.08 0.08 0.080
2-4;d. (ug/l) 0.10 8 100% 0.002 0.002 0.002
2;4-db (ug/l) 0.10 8 100% 0.002 0.002 0.002
2;4;5-t (ug/l) 0.10 8 100% 0.002 0.002 0.002
aldrin (ug/l) 0.03 8 100% 0.003 0.003 0.003
alpha hch(bhc) (ug/l) 0.10 8 100% 0.002 0.002 0.002
ammonium (mg/l nh4) 0.50 38 100% 0.009 0.015 0.009
antimony (ug/l) 5.00 8 100% 0.12 0.150 0.120
asulam (ug/l) 0.10 8 100% 0.007 0.007 0.007
atrazine (ug/l) 0.10 8 100% 0.003 0.003 0.003
benazolin (ug/l) 0.10 8 100% 0.002 0.002 0.002
benzene 1.00 8 100% 0.06 0.06 0.060
benzo (a) pyrene (ug/l) 0.01 8 100% 0.001 0.001 0.001
benzo 3;4 fluoranthene - 8 100% 0.001 0.001 0.001
benzo1;12perylene(ug/l) - 8 100% 0.001 0.001 0.001
benzo11;12fluoranthene - 8 100% 0.001 0.001 0.001
beta hch(bhc) (ug/l) 0.10 8 100% 0.002 0.002 0.002
bromate 10.0 8 100% 0.6 0.700 0.640
bromoxynil 0.10 8 100% 0.002 0.002 0.002
captan (ug/l) 0.10 8 100% 0.002 0.002 0.002
carbendazim+benomyl (ug) 0.10 8 100% 0.002 0.002 0.002
carbon organic total - 8 100% 1.180 1.710 1.401
chloride (mg/l) 250 8 100% 12.500 17.300 15.025
chlorine free (mg/l) - 204 100% 0.020 0.840 0.363
chlorine total (mg/l) - 204 100% 0.070 0.970 0.442
chlorofenvinphos (ug/l) 0.10 8 100% 0.005 0.005 0.005
chlorpyriphos 0.10 8 100% 0.01 0.01 0.010
chlorthalonil (ug/l) 0.10 8 100% 0.003 0.003 0.003
chlortoluron (ug/l) 0.10 8 100% 0.004 0.004 0.004
clostridia (/100ml) 0.00 38 100% 0.000 0.000 0.000
colony count(3days 22c) - 38 100% 1 10.000 1.868
colour (pt/co mg/l) 20.0 38 100% 0.4 1.600 0.634
conductivity (us/cm) 2500 38 100% 225.000 355.000 277.921
cypermethrin 0.10 8 100% 0.003 0.003 0.003
dde (pp') 0.10 8 100% 0.002 0.002 0.002
diazinon (ug/l) 0.10 8 100% 0.006 0.006 0.006
dibromochloromethane - 8 100% 1.980 3.310 2.953
dicamba (ug/l) 0.10 8 100% 0.002 0.002 0.002
dichlorfluanid (ug/l) 0.10 8 100% 0.004 0.004 0.004
dichlorobromomethane - 8 100% 7.370 11.300 9.386
diclorprop 0.10 8 100% 0.002 0.002 0.002
dieldrin (ug/l) 0.03 8 100% 0.002 0.002 0.002
diuron (ug/l) 0.10 8 100% 0.003 0.003 0.003
endosulphan a (ug/l) 0.10 8 100% 0.003 0.003 0.003
endosulphan b (ug/l) 0.10 8 100% 0.003 0.003 0.003
endrin (ug/l) 0.10 8 100% 0.003 0.003 0.003
ethofumersate (ug/l) 0.10 7 100% 0.006 0.006 0.006
faecal coliforms(/100ml) 0.00 204 100% 0.000 0.000 0.000
faecal streptoc.(/100ml) 0.00 8 100% 0.000 0.000 0.000
fenpropidin (ug/l) 0.10 8 100% 0.004 0.004 0.004
fenpropimorph (ug/l) 0.10 8 100% 0.002 0.002 0.002
fluoranthene (ug/l) - 5 100% 0.003 0.111 0.030
fluoride (mg/l) 1.50 8 100% 0.009 0.058 0.019
gamma hch(bhc) (ug/l) 0.10 8 100% 0.002 0.002 0.002
heptachlor (ug/l) 0.03 8 100% 0.002 0.002 0.002
heptachlor epoxide(ug/l) 0.03 8 100% 0.002 0.002 0.002
hexachloro- benzene 0.10 8 100% 0.002 0.002 0.002
indeno 1;2;3-cd pyrene - 8 100% 0.002 0.002 0.002
ioxynil (ug/l) 0.10 8 100% 0.001 0.001 0.001
isoproturon (ug/l) 0.10 8 100% 0.002 0.002 0.002
linuron (ug/l) 0.10 8 100% 0.005 0.005 0.005
m.c.p.a. (ug/l) 0.10 8 100% 0.002 0.002 0.002
mcpb (ug/l) 0.10 8 100% 0.002 0.002 0.002
mecoprop (ug/l) 0.10 8 100% 0.002 0.002 0.002
mercury (ug/l) 1.00 8 100% 0.012 0.012 0.012
metamitron (ug/l) 0.10 8 100% 0.003 0.003 0.003
methabenzthiazuron(ug/l) 0.10 8 100% 0.003 0.003 0.003
nitrate (mg/l no3) 50.0 8 100% 5.497 8.915 6.982
nitrite (mg/l no2) 0.50 8 100% 0.003 0.003 0.003
odour dilution number 0.00 38 100% 0.000 0.000 0.000
op dde (ug/l) 0.10 8 100% 0.002 0.002 0.002
op ddt (ug/l) 0.10 8 100% 0.002 0.002 0.002
op tde (ug/l) 0.10 8 100% 0.002 0.002 0.002
parathion (ug/l) 0.10 8 100% 0.006 0.006 0.006
pentachloro-phenol 0.10 8 100% 0.002 0.002 0.002
permethrin (ug/l) 0.10 8 100% 0.004 0.004 0.004
ph 6.50 38 100% 7.050 8.270 7.995
ph upper limit 9.50 38 100% 7.050 8.270 7.995
phosphorus (ug/l) 2200 8 100% 544.000 755.000 642.500
pp ddt (ug/l) 0.10 8 100% 0.002 0.002 0.002
pp tde (ug/l) 0.10 8 100% 0.003 0.003 0.003
propachlor (ug/l) 0.10 8 100% 0.005 0.005 0.005
propazine 0.10 7 100% 0.004 0.004 0.004
propetamphos (ug/l) 0.10 8 100% 0.007 0.007 0.007
propyzamide 0.10 8 100% 0.004 0.004 0.004
radio activity alpha 0.10 8 100% 0.004 0.031 0.011
radio- activity 1.00 8 100% 0.023 0.047 0.036
simazine (ug/l) 0.10 8 100% 0.007 0.007 0.007
sulphate (mg/l) 250 8 100% 22.100 36.900 26.700
taste dilution number 0.00 38 100% 0.000 0.000 0.000
terbutryn (ug/l) 0.10 8 100% 0.003 0.003 0.003
tetrachloroethene(ug/l) 10.0 8 100% 0.06 0.12 0.088
tetrachloromethane(ug/l) 3.00 8 100% 0.02 0.04 0.031
total aluminium (ug/l) 200 38 100% 5 18.000 8.500
total arsenic (ug/l) 10.0 8 100% 0.37 0.37 0.370
total boron (mg/l) 1.00 8 100% 0.017 0.017 0.017
total cadmium (ug/l) 5.00 8 100% 0.06 0.06 0.060
total chromium (ug/l) 50.0 8 100% 0.7 0.7 0.700
total coliforms(/100ml) 0.00 204 100% 0.000 0.000 0.000
total copper (mg/l) 2.00 8 100% 0.003 0.091 0.033
total cyanide (ug/l) 50.0 8 100% 0.7 0.800 0.710
total iron (ug/l) 200 38 100% 7 175.000 22.000
total lead (ug/l) 25.0 8 100% 0.5 2.100 0.700
total manganese (ug/l) 50.0 38 100% 1.5 3.300 1.770
total nickel (ug/l) 20.0 8 100% 0.9 1.300 0.950
total pah 0.1 8 100% 0.000 0.000 0.000
total pesticides 0.5 8 100% 0.000 0.000 0.000
total selenium (ug/l) 10.0 8 100% 0.22 0.22 0.220
total sodium (mg/l) 200 8 100% 8.700 11.000 10.025
total trihalomethanes 100 8 100% 27.850 43.910 35.041
tribromomethane (ug/l) - 8 100% 0.1 0.230 0.163
trichloroethene (ug/l) 10.0 8 100% 0.1 0.16 0.138
trichloromethane (ug/l) - 8 100% 18.500 29.300 22.650
trietazine (ug/l) 0.10 8 100% 0.006 0.006 0.006
trifluralin 0.10 8 100% 0.002 0.002 0.002
tritium 100 8 100% 5 5 5.000
turbidity (ftu) 4.00 38 100% 0.03 0.300 0.066
water temperature (c) 25.0 204 100% 1.600 19.400 11.759
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post #3 of 15 (permalink) Old 07-31-2012, 07:10 PM
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Chances are there is probably plenty of calcium and magnesium in your water if it comes from a treated source. Both elements are residuals of the treatment process. What is the gh of your tap water?
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post #4 of 15 (permalink) Old 07-31-2012, 07:13 PM Thread Starter
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140ppm
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post #5 of 15 (permalink) Old 07-31-2012, 07:16 PM
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What did you test it with?
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post #6 of 15 (permalink) Old 07-31-2012, 07:18 PM
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I can't say based on the info if you need to add MgSO4. I can tell you though according to this calculator, you are adding 18+ppm a week. You do not need that much. You can shoot for an extra 5-8 ppm or so per week and should be fine.
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post #7 of 15 (permalink) Old 07-31-2012, 07:24 PM Thread Starter
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I used a nutrafin gh/kh test (liquid)

Maybe just right down then? Like jgb77 said?
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post #8 of 15 (permalink) Old 07-31-2012, 07:27 PM
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The gh of your tap water is more than enough. No need to add anything to boost it.
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post #9 of 15 (permalink) Old 07-31-2012, 07:36 PM Thread Starter
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Ok cheers guys.

I'll add nothing and monitor it for the next few weeks.
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post #10 of 15 (permalink) Old 07-31-2012, 11:24 PM
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Once your tank is stable, and the plants are growing well, you can experiment with adding a little Mg, to see if you can detect any changes from doing so. If you can't, then why do it?

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post #11 of 15 (permalink) Old 08-01-2012, 12:55 AM
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With that high GH in the tap water, I agree with the above: There is probably plenty of Ca and Mg in the water as it is. That is almost hard enough for Rift Lake Cichlids!
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post #12 of 15 (permalink) Old 08-01-2012, 04:30 PM Thread Starter
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Ok cheers much appreciated
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post #13 of 15 (permalink) Old 08-06-2012, 04:30 PM Thread Starter
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Hi there,

Since I started this thread I have contacted my water company and they have very kindly told me how much calcium and magnesium is in my water.

I have :-

7.8mg/l (maximum dissolved magnesium)
41.0mg/l (average calcium hardness)

So with these results can I take this as non limiting? Assuming 50% wc/weekly, co2,high lighting, and ei dosing.

Cheers

Mark,
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post #14 of 15 (permalink) Old 08-06-2012, 04:44 PM
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Quote:
Originally Posted by wizza View Post
Hi there,

Since I started this thread I have contacted my water company and they have very kindly told me how much calcium and magnesium is in my water.

I have :-

7.8mg/l (maximum dissolved magnesium)
41.0mg/l (average calcium hardness)

So with these results can I take this as non limiting? Assuming 50% wc/weekly, co2,high lighting, and ei dosing.

Cheers

Mark,
Hello Mark,
Those numbers are fine. There is no need to add any more that what you have.

John
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post #15 of 15 (permalink) Old 08-06-2012, 04:46 PM Thread Starter
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Great thanks
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