Flow & hole placement feedback.

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I don't know how people with large glass tanks sleep at night regardless of how many holes the panels might have... I'm an acrylic guy, glass scares me! If drilling weakens glass, then I'm all in favour of NOT doing it!

I don't use penductors. I agree, they look silly.

It is pretty easy to hide the intakes...but, yes, it is more difficult to hide the outputs because putting anything in front of them kind of defeats their purpose.

The four outlets I have on the bottom of the tank are effectively invisible. They shoot up at a 45 degree angle, but there are rocks blocking direct view from the front and sides.

There is another philosophy that this touches upon. I'm a big believer in leaving the system alone. There are places of low and higher flow in the system, but leaving the flow alone for a long time allows life to thrive in the flow/light conditions that it prefers. I've noticed this effect with sponges in particular that tend to find high flow, low light places only.