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07-18-2014, 11:52 PM #1401
07-19-2014, 12:06 AM #1402
its says: Crushed coral raises GH too and you don't have much control over it (it is slow to dissolve and will raise the KH and GH continually between water changes). "
In everything I've read, I missed that crushed coral will raise GH as well as KH. I only want to raise the KH high enough to have some buffering power to keep the pH a little higher so it's more in line with what comes out of the tap.
Also, it says the coral is slow to dissolve. How slow is slow? This implies that both GH and KH will continue to rise after an initial addition of CC. Does that mean it will not level off?
Now I'm worried again that I'm going to cause an unstable pH if I add the coral and cause more problems.
07-19-2014, 12:15 AM #1403
here is sample from this link:
Altering Your Water's Chemistry
Hardening Your Water (Raising GH and/or KH)
The following measurements are approximate; use a test kit to verify you've achieved the intended results. Note that if your water is extremely soft to begin with (1 degree KH or less), you may get a drastic change in pH as the buffer is added.
To raise both GH and KH simultaneously, add calcium carbonate (CaCO3). 1/2 teaspoon per 100 liters of water will increase both the KH and GH by about 1-2 dH. Alternatively, add some sea shells, coral, limestone, marble chips, etc. to your filter.
To raise the KH without raising the GH, add sodium bicarbonate (NaHCO3), commonly known as baking soda. 1/2 teaspoon per 100 Liters raises the KH by about 1 dH. Sodium bicarbonate drives the pH towards an equilibrium value of 8.2.
07-19-2014, 12:27 AM #1404
In fact, the more I read, the more I waffle about what, if anything, to do.
I really appreciate all of your attempts to help. I guess I'm just going to have to dig in deeper to the entire KH and pH issue before I make any moves. When I finally get my book done - THEN I can give it more attention.
07-19-2014, 12:39 AM #1405
I went through this with my tanks. But want to go lower. My water is perfect for african cichlids. But will work for Sa cichlids. So i read and researched and came to the desiscion to leave it alone for now.
07-19-2014, 12:30 PM #1406
Cindy, I have about 6 cups of crushed coral in my 135 (40 gallon sump so approximately 175 total) and haven't noticed any increase in GH. I talked to the owner of a lfs and he uses crushed coral as the substrate for his cichlid tanks that require higher GH then our local water._______________________________________________
07-19-2014, 12:56 PM #1407
07-20-2014, 04:55 PM #1408
I replace it about every three months, basically when I start to notice my ph slowly dropping. I invested in one of those Seneye monitors so I can easily watch my tanks parameters (temperature, ammonia & ph), now if they would only add a nitrate monitor it would be perfect!_______________________________________________
07-21-2014, 02:01 PM #1409
Again, thanks Judi.
Just got word that my crushed coral is on back order. Won't be here until July 26th. Of course, we are gone to the cabin again and won't return until Aug 5th. So ... I can't start my coral treatment until then.
It's been a week since I did my last W/C and cleaned the canisters at the same time. Thought I'd better check parameters just in case deep cleaning the cans caused a mini spike. Absolutely no problems. A and Nitrites were 0 and Nitrates were between 10 and 15. Woo woo.
Ph, however, was down to almost 6 - which has me a bit worried.
pH in my 30 BTW is up to 7 so that's good but I have no idea why it increased.
So, I'm going to try an experiment and NOT dose Metricide in the 90 for a few days before we leave. That gives me until Friday. If the pH goes up, then I'll know the Metricide (which is more or less a liquid Co2) may be contributing to the low pH. Of course, I'll have that $%^#@# algae back without it but I can start dosing again once I get the crushed coral in the tank.
Anyway that's my theory and my plan. Thoughts??
07-21-2014, 02:53 PM #1410