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Re: Aquatic Plants Digest V3 #75

I have a 125g tank with moderate light levels CO2 injection and 7.0 pH.
I use PMDD .  When I make my weekly 25% water change the plants put out
O2 like crazy for one day.  Then they return to rather unspectacular
growth.  The plants are rotala i., ludwiga r., swords and a few misc.  I
live near Chicago and use tap H2O for changes.   My tank nitrates are
5ppm and PO4 is 0.2 ppm.  I'd like to have O2 coming off m plants
throughout the photoperiod.  Any advice?
Thanks in advance,