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post #1 of 4 (permalink) Old 04-18-2008, 09:05 PM Thread Starter
 
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Plants Consumption

I realize that the hobby grade test kits are not the greatest, but here's my situation. I have a 10G, heavily planted that I've just upgraded my lighting on. For now, until they're used up, I'm using the Seachem line of ferts and I'm trying to tweak dosing to match my new lighting. As of now I have 2 36w CF-running one all day and a 3 hr burst for the second. I had been using the seachem dosing schedule, then started seeing a bit of GSA and tested my Po4- It was low. I'm trying to raise my PO4 and NO3 levels a bit. During this past week I've been doing 4ml (.48ppm) PO4 and 3ml(5.23ppm) NO3 per day. The next day I check the levels and they are exactly what they were the previous day before dosing. Is it possible for my plants to be using this much?
Or are my test kits way off? Should I up the dosing even more to bring my levels up? I'm shooting for at least 10 NO3 and between 1-2 PO4. Thanks in advance!
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post #2 of 4 (permalink) Old 04-19-2008, 08:05 AM
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To ensure that your test kits are working, you could always make reference solutions for nitrates and phosphates....I know there are some posts around here, but it's 3 am, and I'm lazy right now...

However, with that much light over your tank, it definitely is possible for those plants to suck up nutrients as fast as you put them in. I also hope you're injecting CO2, or else you'd definitely be asking for algae soon.

Also, you shouldn't keep light running all the time (I noticed that you said you have two 36W CFs, with one running all day). Plants do need a dark cycle in order to grow.

Anthony


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post #3 of 4 (permalink) Old 04-19-2008, 02:15 PM Thread Starter
 
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I guess I should have clarified. I have pressurized CO2 running at about 40ppm, and an 8 hr photo period. I had a problem before my new lights got here and my nitrates dropped to 0. The GSA started soon after that, so I believe that the nitrate and PO4 triggered it.
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post #4 of 4 (permalink) Old 04-19-2008, 04:52 PM
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Do the bucket test

Fill a 5 gal bucket with water that you know has no N or P (maybe your tap water?). Then add enough N/P to bring it to the level that you are shooting for. Now pull out the testkit and see what you get!

So if you add 3 ml Flourish N to the bucket, you testkit should come in roughly at 10 ppm. Does it? If it does, then you can slowly up your dosing. If not, then throw it out.


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