11-03-2013, 07:47 PM
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I've heard of royal plecos eating holes in broad leaf plants. I imagine stem plants wouldn't fare very well with a pleco, especially ones known to redecorate when it suits them. If you were going to try any live plants you might want to try floaters.
Honestly if you're having nitrate problems, a wood eating pleco that size might be part of the problem. Those guys produce a ton of waste. Not sure if you're aware, but 6-7" is roughly only half grown. Normally royals are suggested for tanks 125 gallons or bigger.