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Carbonate hardness is the same as Alk. I would also leave it alone, it will fall in time on its own. Furthermore, Nitrification will use up Alk components as it proceeds.There are some nasty means of lowering it but I wouldn't get into it NH4+(ammonia) + 2 02 + 2 HCO3(Bicarbonate)- ---> NO3(Nitrate) - + H2CO3(Carbonic Acid) + H20 -- Boomer Want to talk chemistry ? The Reef Chemistry Forum http://www.reefcentral.com/vbulletin/index.php Want to See More ? Please Join Our Growing Membership www.coralrealm.com If You See Me Running You Better Catch-Up "Marc Levenson" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] : If "Carbonate Hardness is the same as Alkalinity, alkalinity will drop if you : don't add any further buffers to your tank, and you are using RO/DI water. 19 : dKH is very high, higher than the scale on my Salifert test kit. : : Marc : : : J&T wrote: : : > Have a new reef tank which was filled 5 days ago - water tests seem ok : > except for high KH which I'm not sure what to do about. It's possible too : > much buffer was added by the supplier who installed my tank. : > : > 100 gallon tank with Ratz sump/trickle filter/skimmer/calc reactor. Tank : > maturing with 100lbs fresh live rock and rotifers, flow rate 2000 ltrs/hours : > plus additional flow off 4x1800ltr/hr power heads. Metal Halide & marine : > blue tubes for lighting. : > : > Test readings at 5.30pm today were: : > Temp 26deg C : > SG 1.025 : > PH 8.3-8.6 : > Total Ammonia 5.0mg/l : > Nitrite 0.3mg/l : > Nitrate 12.5mg/l : > Oxygen 5.0mg/l : > Phosphate 0.25mg/l : > Carbonate Hardness 19dKH (340ppm) : > : > Can anybody suggest what action do I need to take? ..... if any : : -- : Personal Page: http://www.sparklingfloorservice.com/oanda/index.html : Business Page: http://www.sparklingfloorservice.com : Marine Hobbyist: http://www.melevsreef.com : :
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