Aragonite is the crystal form of calcium carbonate (CaCO3). Just like with crushed coral, acids in the water cause aragonite to release calcium and carbonate. Feasibility Study Final Report: Geodetic Optical Photographic Satellite System, Volume 2 Data Collection System" (PDF). National Reconnaissance Office. June 1966. Archived from the original (PDF) on 12 December 2013 . Retrieved 19 December 2010. BYEMAN codenamed GAMBIT, the KH-7 ( Air Force Program 206) was a reconnaissance satellite used by the United States from July 1963 to June 1967. Like the older CORONA system, it acquired imagery intelligence by taking photographs and returning the undeveloped film to earth. It achieved a typical ground-resolution of 0.61m (2ft 0in) to 0.91m (3ft 0in). [1] Though most of the imagery from the KH-7 satellites was declassified in 2002, details of the satellite program (and the satellite's construction) remained classified until 2011. [2] In saltwater tanks, KH serves a second purpose. Corals use carbonates to build their exoskeletons. If you are creating a reef tank, you’ll need to watch that KH! Having a stable pH that is a little high is much better than a pH that swings up and down all the time. How do you test the KH of your aquarium?

While the set-up costs may be pricey, it will save you a considerable amount of money in the long term, especially if you buy bottles of distilled water each week. While there are aquarium test strips available that can also test for carbonate hardness or KH, I don’t recommend them. Based on personal experience, test strips are much less accurate than liquid test kits. Who knew keeping goldfish could be so difficult! Next time someone offers free fish, I think I’ll politely decline. The problem is that I am attached to these things now more than the kids are.

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The planet asks us for changes and we should not wait for an institutional reaction,” said Juvanteny at a media event on Wednesday. “We have to do it together and start now. We are an amateur team with the desire to do different, innovative things and thus contribute a small grain of sand on the planet which asks us to.” It’s actually possible for your tap water to have a really high GH and a very low KH. So, just having a high GH does not automatically mean that you also have a high KH. Why is KH important to your aquarium? I have recently (8 days ago) setup a 125 gallon aquarium as a tetra (Diamond, Gold, and Neon) only tank…no fish have been added to the tank yet. Test your tap water and see if it is over 4 dKH. If so, a weekly 25% water change will replace the depleted KH. Another concern of mine is i have tested all the bottled waters i can buy including the tap water and the one i use (like the rest) has 8.0PH (which was one of the main reason i wanted to use RO) but somehow the tank has 6.8ph, i use C02, tropica plant soil, mopani wood and almond leaves, (a little low on GH but i will add some equlibrium today to raise it 5/6). My biggest fear is If this 6.8ph is something temporary i might have problems in the future.

The index camera is a copy of cameras systems previously used in the KH-4 and KH-6 satellites, and takes exposures of Earth in direction of the vehicle roll position for attitude determination. The stellar camera takes images of star fields with a reseau grid being superimposed on the image plane. [6] The S/I camera was provided by Itek, and horizon sensors were provided by Barnes Engineering Co. [1] Orbital Control Vehicle and Recovery Vehicle [ edit ] A film capsule being retrieved.FishLab Tip: Have you ever tried to lower the pH of your tank but noticed it didn’t change? KH (carbonate hardness) is preventing the change. You need to reduce your KH before you can adjust the pH. What is the best KH level for your tank?

But here’s the thing. Those waterways have a LOT of other variables that help keep the pH level relatively stable. I had a very low ph in champs tank about a month ago and I used the alk buffer and his has stayed between 7.2-7.6, just now its 7.6 so that seemed to work…. It seems that either i will use RO water with equlibrium + some other checmicals “like a chemist” which will help to raise my gh/ph/kh to current level or i will continue using the bottled water and hope that it will somehow drops that 8.0 ph to 6.8 as it does since now.If you have a saltwater tank, it’s basically expected that you will have one of these units nearby. 4. Indian almond leaf FishLab Fact: Carbonate Hardness is shortened to KH because it is derived from the German spelling of the word, Karbonate Hardness. What is the difference between KH and GH?

a b "KH-7 Camera System- Part I". National Photographic Interpretation Center. July 1963. Archived from the original on 15 September 2012 . Retrieved 26 September 2011.Note: The results of the test can be given in dKH or PPM. Which you use is a matter of choice. I personally use dKH and refer to it from now on. I have NEVER had ammo readings in his tank as I’ve had him about 8 months and believe he’s cycled. I don’t know why the sudden PH swings. That isn’t normal at all. In 5 days it went from 7.2 to 6.0 and its very light so with the API master kit only showing the light yellow even if it’s below that scares me. I cannot seem to get the ammonia down. I do regular water changes of about 10% of the tank. I got a gravel vac and have used it twice in the past 2 weeks. We have a whole home soft water system, so any tap water I add sits out for 24 hrs before the change. As the Indian almond leaves break down in your tank, they release tannic acid (tannins). These tannins eat away at the KH.