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jungle vals Vallisneria grow very slow

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Time.  Mine did nothing for over a year, then took off as the tank "matured."  If you're struggling with algae out-competing plants, consider scheduling a "siesta" (four hours or so of lights off) in the middle of your lights-on period.  That allows the CO2 level in the tank to build up again to support plant photosynthesis - might let you keep the lights on for longer overall each day which might benefit the vals.   Maybe also add some fast growing floaters like anacharis.  Those two interventions helped me.

Make sure also you aren't deficient in any nutrients for the plants - ie use a full-spectrum fertilizer, keep nitrates 20-40 range etc.

Have fun and good luck!  Once vals get going they're beautiful.  

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