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Old 08-28-2014, 11:42 PM   #1
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Limestone Rock for Tank

Hi all,

I live in an area where you physically can't dig a hole deeper than 10 centimetres without hitting limestone.

Can I use this (after washing in really well and maybe even boiling it) in a tank with electric yellows?

There's some really interesting rocks that have been dug up whilst they clear land over the road from me, and it looks like what you get from the lfs.

Any advice would be great!

Cheers,

Ben


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Old 08-28-2014, 11:51 PM   #2
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I wouldn't. All of that calcium carbonate will leach into your aquarium and slowly raise your pH.
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Old 08-28-2014, 11:51 PM   #3
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What kind of rock is it that the pet shops sell?


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Old 08-28-2014, 11:59 PM   #4
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What kind of rock is it that the pet shops sell?
All different kinds. Go to yours and ask for rocks that won't leach carbonate into your freshwater tank.
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Old 08-29-2014, 01:17 AM   #5
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Limestone isn't necessarily a bad thing, if you have soft water it can be quite beneficial, but it will cause your pH to raise. Calcium carbonate isn't really soluble in water, so it is a relatively slow change, but a change nonetheless. Quartz, granite, and slate are all good choices of you can find them laying around.

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Old 08-29-2014, 04:33 PM   #6
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The LIMESTONE at your LFS is the same thing if you want LINESTONE to raise your PH to keep mbuna or something then it would work. Same thing here the taps PH is alrady high from all the limestone.
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Old 08-29-2014, 06:16 PM   #7
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I was given a whole heap of limestone when I was looking at setting the tank up for cichlids. This stuff was more crumbly and would probably have reacted quite quickly (sometimes I wonder if my retaining wall is built from the same stuff).

Other limestone I have seen looks as tough as nails. If you had to bash it quite a bit to get it out, it will probably be slower reacting.
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Old 08-29-2014, 07:15 PM   #8
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I was given a whole heap of limestone when I was looking at setting the tank up for cichlids. This stuff was more crumbly and would probably have reacted quite quickly (sometimes I wonder if my retaining wall is built from the same stuff).

Other limestone I have seen looks as tough as nails. If you had to bash it quite a bit to get it out, it will probably be slower reacting.
Yes, keyword is surface area.

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Old 08-29-2014, 07:25 PM   #9
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Yes, keyword is surface area.

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true, this stuff is really bad - it's like beach sand that has stood still for too long. I think water would penetrate it very well. Kind of like my retaining wall....
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Old 08-29-2014, 10:09 PM   #10
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I'll have a look and see if it's the crumbly stuff or not. I think it's what you'd call cap rock and had to be dug up by a 40 tonne digger. If it's the same as what was removed when we put in our pool, it's ridiculously hard.


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Old 08-30-2014, 12:48 AM   #11
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I use limestone in my tanks. I live in an area that has a ton of limestone and quartz. The hard limestone will only raise your PH slightly. I use it to keep my PH stable.
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Old 08-30-2014, 01:03 AM   #12
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I use limestone in my tanks. I live in an area that has a ton of limestone and quartz. The hard limestone will only raise your PH slightly. I use it to keep my PH stable.

Just out of interest I assume gh/kh would also show little change for you? I find with crushed shells they don't do much as tank ph is already 7.6 or so.
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Old 08-30-2014, 01:34 AM   #13
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I have never noticed an effect on my KH or GH. My Ph stays around 7.6.
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Old 08-30-2014, 02:43 AM   #14
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Makes sense. Many thanks on the reply.
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Old 09-01-2014, 05:38 AM   #15
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Soaking some now. Looks like it could be pretty soft.
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Old 09-01-2014, 10:19 AM   #16
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You could try putting vinegar on and see if you get any fizzing (might need a magnifying glass). If no bubbles, could still be limestone just not very reactive (maybe high magnesium content).
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Old 09-01-2014, 11:04 AM   #17
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Sounds like a job for the morning!
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Old 09-01-2014, 07:24 PM   #18
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If you can get hold of pool acid (I think it is) that should be stronger than vinegar (weak acid) and a better test. Vinegar is a nice test though, if it reacts to vinegar than the rock is fairly reactive.
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Old 09-03-2014, 11:36 PM   #19
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A great source for aquarium rock is your landscape supply yard. My LFS wanted $15-$30 for some pieces of stone. I went to the local landscape yard and bought 200 lbs of rock for $40.00 I bought some interesting pieces of Lace Rock.

Just an FYI...

The acid test is always a good one.
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Old 09-04-2014, 10:09 AM   #20
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Thanks! I'll give them a shot
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