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post #1 of 5 Old 03-17-2010, 05:39 PM Thread Starter
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Corys and pH

So I tested my tanks the other day. My oldest tank dropped in pH big time(over time not suddenly) to 6.0 the lowest on the card. Also my tap has 0 KH so it can jump around. I read online crushed coral would work. In 3 of my tanks I just sat a filter bag half full with some of it. In the 12 gallon (pandas and pygmys) I laid it in the filter. Well that tank had the biggest change in a very short time period. The others went up just a little but the KH didnt budge much at all.

My pH reading yesterday was 6.0 with a KH of 0 ppm. Today its 7.2 with a KH of 20 ppm.
I am just worried bout how such a big change so fast will affect them,especially the pygmys as I know they are quite sensitive. Should I cut whats in the bag by half or just keep an eye on it? Should I do a WC? BTW my tap is 7.2 pH.

Thanks

3 gallon male betta
10 gallon male betta
12 gallon QT
30 gallon
1 Pl*co, Brochis Splenden,False Julii Cory,Pygmy Corys,Female Betta,Harlequin Rasbora,Tetras
55 gallon Possible Barb tank?!



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post #2 of 5 Old 03-18-2010, 02:50 AM
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Quote:
Originally Posted by fishyinpa View Post
So I tested my tanks the other day. My oldest tank dropped in pH big time(over time not suddenly) to 6.0 the lowest on the card. Also my tap has 0 KH so it can jump around. I read online crushed coral would work. In 3 of my tanks I just sat a filter bag half full with some of it. In the 12 gallon (pandas and pygmys) I laid it in the filter. Well that tank had the biggest change in a very short time period. The others went up just a little but the KH didnt budge much at all.

My pH reading yesterday was 6.0 with a KH of 0 ppm. Today its 7.2 with a KH of 20 ppm.
I am just worried bout how such a big change so fast will affect them,especially the pygmys as I know they are quite sensitive. Should I cut whats in the bag by half or just keep an eye on it? Should I do a WC? BTW my tap is 7.2 pH.

Thanks
Yes ,I would reduce the amount by half. I have not needed to use coral in some time but found that 1/2 cup to one cup per twenty gal to work for me.Smaller tanks than twenty gal would need less.

The most important medication in your fish medicine cabinet is.. Clean water.
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post #3 of 5 Old 03-18-2010, 11:32 AM Thread Starter
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Okay thanks. I am about to test the tank again. Do you think my corys will be okay though? They seem fine,swimming around like normal.

3 gallon male betta
10 gallon male betta
12 gallon QT
30 gallon
1 Pl*co, Brochis Splenden,False Julii Cory,Pygmy Corys,Female Betta,Harlequin Rasbora,Tetras
55 gallon Possible Barb tank?!



Swim free

All my past fishies


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post #4 of 5 Old 03-19-2010, 12:40 AM
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Originally Posted by fishyinpa View Post
Okay thanks. I am about to test the tank again. Do you think my corys will be okay though? They seem fine,swimming around like normal.
Can't say ,all fish react differently to changes in water chemistry.Need to be careful when using things that change the chemistry. With Gh and Kh so low,,coral will work more quickly than it would in water that had some buffering capabilities and should be used a little at a time for this reason.

The most important medication in your fish medicine cabinet is.. Clean water.
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post #5 of 5 Old 03-20-2010, 04:38 PM
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I agree with 1077, such rapid (relatively) fluctuation is serious, but what is done is done.

Any other fish in the cory tank? Were there pencilfish in there, the diptail Nannostomus eques if memory serves me--unless I'm thinking of another member? If this is true, the lower pH will not bother them at all. My 90g has these two species and many others, it is pH 5 or maybe less. But, steadying it with coral is not a bad idea. If you could keep the pH at 6 it would be perfect.

I can explain this further if you ask. I've a lot of experience with this issue, my tap water is zero hardness and I buffer my 115g with dolomite but I don't touch the other two currently.

Byron.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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