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Greetings!  In general, how much circulation is good for keeping
plants?  Also, in using a powerhead as a sponge filter, is it best to
use air bubbles or not?  I have a 100-gal. planted tank which uses a
Penguin 330 power filter.  It didn't seem to be keeping up with the
tank, so I got a couple power heads with sponges to help.  One of the
power heads is hooked up to my DIY Co2, but the other one can go either
Thanks in advance,
Eric in Sacramento, CA