I have a little more fish than a couple in my tank that is evident. But shows also that my Bio is working Well and the filter is converting everything over easy. I don't really think anything other than water changes can help it. If I am wrong though please tell. And filling the top 10x4 area with Pothos is not really an option. But I'll look into it for you just as some fun. Putting some plants in the display tank.
Id say 2-4 healthy plants will make a good dent in those levels, mine were consistently 60ish and now 30max, and that's with 1 healthy plant, plus with spikes like that the plant will flourish even more and help purify the air in your house!
Love that setup!
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http://www.monsterfishkeepers.com/forums/showthread.php?504763-Cheap-plants-less-nitrate!-POTHOS
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