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What is the fish load? How often and how much do you feed? Describe the plant mass / density. How are the plants doing? How much light? High pressure or DIY C02? How old is the charcoal?

If you are not dosing any ferts and one or more are at 0 then your plants may not be able to consume the P fast enough? It may simply be a case of having a shortge of some other nutrient.

Jay Reeves
 

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Sorry, I missed that you had some of the stats in your first post. I wouldn't add any N. Don't worry about ratios right now. You could vacuum the top 1" or so of gravel in case any of the fert tabs are causing increased P. I used the Jobes spikes once and had some problems, but know that some folks really swear by them.

C02 is OK if your test kits are reasonable. With 3.28 watts per gallon you probably need to be adding some water column ferts. You may need potassium and traces.

Ask your water utility to fax or email you a list of the contents of your water. My water has less than 1 ppm P, but some communities may add more. The lost of what is in your water is handy to have in any case.

If I remember correctly Tom B. has driven P levels to 5 or higher without problems as long as other nutrients were available and as he would say - check your C02. Make sure your test results are reliable.

HTH,
Jay Reeves
 
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