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Go Bucks!
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40 is a little high. It does not look like you have a UGF (can cause Nitrate to be hgh) so that is not a issue. Why don't you test your tap water? Some people are finding that their tap water has high levels of Nitrate. Also more water changes will help.
 

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Go Bucks!
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3,164 Posts
Could be, but it depends on how many water changes you have done since then? I also have a 55 with three 5" RBPs and I do 30% water changes about every 6 days. I also do a complete tank cleaning over a 12 day period and my Nitrate level is well below 20. You may want to increase the cleaning and see if it helps.
 
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