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**To**:**<Aquatic-Plants at actwin_com>****Subject**:**FW: Confusion/questions on dosing Seachem Nitrogen...****From**:**"Bodin Family" <bodin.family at verizon_net>**- Date: Thu, 30 Jan 2003 09:36:12 -0800
- Importance: Normal

Directions state: "DIRECTIONS: BEGINNER: Use 0.5–1 mL (dispenser enclosed) for each 80 L (20 gallons*) twice a week. EXPERT: The beginner dose raises nitrogen by the same degree that 0.45–0.90 mg/L nitrate would. This dose is sufficient to provide approximately 4 g of growth (dry) or about 20 g (hydrated) over a 1 month period (assuming all other necessary nutrients are provided). For increased growth use proportionately more. To target a specific nitrogen increase, dose according to the following formula: 0.25vn=m, where v= volume of tank in gallons*, n=desired nitrogen increase (for a desired nitrate increase use a factor of 0.05 instead of 0.25 in the formula) and m=volume of product to use in mL. For example to raise 20 gallons* by 0.20 mg/L nitrogen you would use: 0.25*20*0.20=1 mL. (For 2 & 4 L containers, 1 capful is 10 mL)." Now, onto my problem and where the confusion arises... I want to keep approximately 5ppm of N available for plant intake. According to my estimates, should I use the beginner dosage in my 50G (55G - estimated gravel volume) tank, I would add about 2.5ml twice per week. Or as I read it the beginner dose yields almost 1ppm of available N (added twice per week) - hardly anywhere near a sustained level of 5ppm. Drawing a straight line from here (the beginner dose) to get a 5ppm N would mean I would add 5x this amount, or 12.5 ml (assuming of course that N depletes over the week or at water changing time) twice per week, or 25 ml per week. IF I follow the "Expert" directions, to reach a 5ppm of available N, I would use the formula: 0.25vn=m - For my tank and 5ppm desired N this reads 0.25 x 50 x 5 = 62.5 ml initial dose.... Wow, am I glad I bought the 2L bottle!!! And 12.5ml (or 25ml using the 2x dose per week) is quite a ways from 62.5ml... Does anyone have any practical experience dosing this stuff (assuming a medium-heavily planted tank...). TIA, - Jeff

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