05-08-2012, 07:08 PM
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In a planted tank, you want to maximise CO2. Generally, an established tank will produce CO2 from all the biological activity. The level in the water is thus higher than the normal equilibrum that would form. Since plants require C02 as a nutriment, you want to minimise agitation so you can keep this CO2 in the water. In fact, some people go to a "high tech" setup and inject C02 in the water, you can research this if you want, but keep in mind it is expensive and more labor intensive than a normal, "low tech" setup. The beauty of your proposed setup, with internal filters, is that you would be able to go "high tech" in the future, if you want, since you keep agitation to a minimum.
Please don't hesitate de report back on your setup when you get it running, I am very interested in the performance of these U4 filters.
Also, as food for tought, remember that bowfront tank will distord your view. It's not much, but it's noticeable in my 26g bow.