I have been growing Pothos in my 600 gallons sump for about 5 weeks now. My nitrates still read high. too high for my liking.  Everything else is perfect 0 nitrite and ammonia.  I trimmed all the roots from the plant back to about 1/2"  when first put into the sump. they are growing like crazy Roots about 4-5 inches plus. The plant its self has grown allot also.  No change in nitrates overall.   Lights on 24/7 in the sump for the plant. I took one large plant which tore apart into about 15 little stocks which are growing well. Here is just my experience.  These pictures are from 2 weeks ago so the roots have grown allot more now.  The plant is large remember That's a 125 gallon tank. So 22+ inches tall . Plant holder so 12x10 inches  
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