phosphorus + magnesium
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Old 04-11-2003, 03:40 AM   #1
fishpoop
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my amano shrimp died, they only lasted a few days I wanted them to eat some hair alge but now, after reading more ideas about alge i'm trying to perfect the nutrient levles. I had about .5ppm iron and 5-10ppm nitrate i think the high iron helpes hair alge specificly. my phosphorus reads zero and i dont know anything about magnesium but these are on Chuck's calculator. is it important to raise the phosphorus + magnesium levles, do i need to dose phosphorus to bring it above zero. what happens if i dont?
and how do i avoid overdosing K, b/c there are no test kits for that?
(the Mg levles recomended are 5-10ppm on chucks page)

ps. those amano shrimp were to expencive [$6.99CAN] for the alge they were slowly eating I dont know why they died
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Old 04-11-2003, 08:00 AM   #2
Rex Grigg
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Well if you don't have any Phosphates you will get algae. So you do need to dose them. As for the magnesium you can use epsom salts. To avoid over dosing K just do a 50% water change every week and dose enough to bring that amount of water up to 20 ppm.

Lots of things kill shrimp. Copper levels that are too high. Water too soft. I also dose some iodide in the water for the little guys.
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Old 05-25-2003, 09:10 PM   #3
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Rex is absolutely right. I can tell you from experience. When I started dosing a small amount of phosphate, my algae problem almost completely disappeared. It took a while, though. It goes against the old tradition that phospahtes cause algae... I think we're finding out that too much OR too little phosphates cause algae.

With too little phosphate, plants can't use the other nutrients as efficiently. Also, phosphate is one of the prime constituients of DNA. Your ammonia/nitrite/nitrate processing bacteria colony will suffer as well if phosphates are zero.

Fish food contains some phosphate. If your fish load increases (adding new ones or old ones growing) you may find that your need to add additional phosphate (and nitrate, if you're adding that) decreases. Go slow and test regularly till you get a feel for what your particular tank needs.
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Old 05-26-2003, 02:04 AM   #4
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Tom Barr once wrote that the whole idea that phosphates cause algae was formed in northern lakes with small plant bio-mass. If you go to warmer southern lakes with high to very high plant bio-mass phosphates cause no problems.
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Old 05-26-2003, 09:01 PM   #5
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I still have not got my fertilizing right and so I still have a lot of hair algae. I thought I was doing everything right when I realized I was dosing K for the entire tank volume every week after a 20% water change
my phosphates are still zero; where do I get a small amount of phosphate?
I'v noticed thick green algae between the glass and the gravel, I think the sunlight from a window about 4' from the tank may have been helping the hair alage so i'll keep the shade closed and watch for a difference.
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Old 05-27-2003, 01:02 AM   #6
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Fleet enema is the best way to get a small amount of phosphate.
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Old 05-28-2003, 01:52 PM   #7
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At the risk of sounding stoopid (again), what is K? Man I need a the table of elements.
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Old 05-28-2003, 02:21 PM   #8
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K is potassium.
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Old 05-28-2003, 02:26 PM   #9
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Thanks
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90 gallon tank with water and some fish. Plants died and tank overrun with algae. Lights nearly burst into flames last weekend. Needs lots of help
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