Three weeks in to a new tank - high phosphates - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 02-11-2014, 07:45 PM Thread Starter
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Three weeks in to a new tank - high phosphates

I made some big water changes early on and did a 25% a few days ago. No fish or inverts yet. I was unable to test in the beginning so did my tank even cycle? (That's rhetorical I don't expect anyone to answer that). Before my 25% water change a few days ago the nitates and nitrites were 0, ammonia was around .25 and phosphates were 10. Now my ammonia is between 0 and .25 and my phosphates are 9-10. Why the high phosphate readings - decomp of the organic potting soil substrate? I've been using only RO and distilled in my 15G. Never any tap water. And I went so far as to test my water sources and they read 0 phosphates. I have several low light plants including Anubia/Java Fern.
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post #2 of 5 (permalink) Old 02-12-2014, 05:46 AM
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Did you put the soil through some kind of sifter ? Some(most) organic soil has pieces
of plant matter which in most cases is partially decomposed, contained within it.
Depending on point of origin, the soil it's self may comtain some Phosphates.
I have not used it but just picked up a few pieces of info on it when it was part of a start up thread on a new tank.
Deleting the KH2PO4 from your fert list will use it up but I can offer no further solutions.
In time a more experienced in that aria type person will help you.

The shortest distance between any two points is a straight line...in the opposite direction...
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post #3 of 5 (permalink) Old 02-12-2014, 02:27 PM Thread Starter
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No sifter or mineralizing prior to putting it in so I'm guessing it's the decomp that's driving the phosphates. Thought about putting some api phos zorb in my filter but I'm holding off. I'm not in a big hurry I'll just do water changes and test for it.
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post #4 of 5 (permalink) Old 02-12-2014, 02:40 PM
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If that is the cause it will be there for a while. But plants will use it up and if you don't use ferts or if you take that one from your list it really won't hurt much. Just that that particular nutrient is fuel for algae as well. Floating Hortworth is cheap and can be thrown away after it stops having high readings. Just a thought.

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post #5 of 5 (permalink) Old 02-12-2014, 03:35 PM Thread Starter
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Thanks for the info.
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