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Hygrophila really gets going when CO2 levels are high. Supplemental CO2 is a good bet to have you trimming it back every week.
 

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Yes, Co2 and lots of light will make it grow very well. I run Co2 and have about 4.5W/gallon and it grows like a weed. What I like to do is let it grow long for about 2-3 weeks or so and this causes more branches to grow at the nodes. Then clip those shorter ones and replant them. Trim your main stems down as well and replant. If you bunch them in groups of 3-4 stems per bunch, this seems to help them grow thicker towards the bottom by allowing more light down there. Laterite and substrate fertilizer tabs are also beneficial.
 
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