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Here is PAR data for the Monster Ray: http://www.plantedtank.net/forums/showthread.php?t=383889
Considering the size of your tank and the fact that you have only one fixture, I say you have very low PAR. I don't have any experience or knowledge on amazon swords, but I think your sword will either grow very slowly or not grow at all.
Considering the size of your tank and the fact that you have only one fixture, I say you have very low PAR. I don't have any experience or knowledge on amazon swords, but I think your sword will either grow very slowly or not grow at all.