I'm getting desperate...(56k warning) - Page 2 - The Planted Tank Forum
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post #16 of 18 (permalink) Old 01-20-2004, 09:35 PM
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Join Date: Aug 2002
Location: Portland, OR
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Originally Posted by Knetter
OK! i really appreciate your help guys!...I've ever heard too that the mh lamps degrade when they are getting older. Is it really that the spectral shift does affect plant growth? I think because the lamps are getting less brighter, the plants and thus the algea can "relax" al little bit.
Put it this way: You haven't always had a problem with algae, right? Your dosing regime and CO2 input was perfectly balanced for the lighting you had. Now that the bulbs have aged, lost intensity, and shifted their spectral output, the balance you struck earlier is no longer. You need to adjust accordingly, but the easier alternative to changing your CO2 input and fertilization schedule is to replace the lights and (hopefully) restore the balance you once had.
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post #17 of 18 (permalink) Old 02-03-2004, 03:49 PM Thread Starter
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Join Date: Nov 2003
Location: Amsterdam, The Netherlands
Posts: 155
Hee guys, i've finally got some KNO3 do you guys know how much i have to dose?

- grtz Pepijn
200 Litres Tank (= 52.8 gal); 2150W HCI/Metal Halide (OSRAM powerstar NDL); Dupla press. CO2; eheim 2211 300 L/H; heavily planted; daily, 4 drops of plant24, KNO3
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post #18 of 18 (permalink) Old 02-03-2004, 04:15 PM
Are these real?
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Join Date: Jun 2003
Location: Monterey, CA
Posts: 15,467
Of course! According to Chucks calc, adding 1 gram to your tank will increase the NO3 level by 3.2 ppm.
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