<a href=showthread.php?s=&postid=7964520#post7964520 target=_blank>Originally posted</a> by jjjimmy
JBNY, the biggest problem that I can see with the corner overflow is that it would really distract from the viewing on that side where a center overflow would give you better 3 sided viewing. You could always put some screen over the top of the overflow to keep fish out.
If you look at the picture from the last page you will see that the tank will sit between two shelving units. They come out about 12" from the wall, so having the overflow about 9" out into the tank shouldn't really be noticeable from the side. (I'm hoping

)
I am curious why you are considering using powerheads and/or streams when you are starting from scratch with a new tank. I for one when looking at a tank want to see the beauty of the livestock and not the mechanics (i.e. powerheads) keeping it running. Why not just go with a closed loop right from the beginning, that way all of the equipment will be incognito (sp?).
Well for flow. I can get more flow for less wattage using streams rather than a closed loop. Also with the closed loop, I am stuck with were the returns are. In my last tank, I had to move powerheads more than a few times to make corrections in the flow because of coral growth. Also, in the old tank, the sea swirl on my left side of the tank had a millepora grow right next to it, completely cutting off the flow to everything on the right side of the tank. So by just not putting a closed loop in I am trying to leave myself the flexibility of being able to move my sources of flow to different areas of the tank when the time comes.
The pic below is the situation I am writing about. The Green millepora started off as a 1" frag that was about 8" below the surface. Eventually it grew to fill the space you see plus about 3-4" more. When I took out the coral the main section it was growing from was almost 4" thick!! That coral had been fraged many times, in more than a few cases I fraged pretty big sections of 6" or more.
Here is the same section less than a year later. You can not even see the sea swirl anymore as the corals have grown right around it. I ended up putting a small powerhead in the back to get more flow to some of the other corals that were starting to recede do to lack of flow at this point.
So my thoughts are that if I go with a configuration that hides all my plumbing I will have to rip it out later due to growth.
Also, I just re-plumbed some of my 180 and decided to go with the Sequence Manta Ray pump. It is an absolutely kick butt pump and runs everything that I have with pressure to spare. Just a thought.
I've had a Sequence 6000 for the last 4 years. Over 3000GPH at 20' HP it's a great pump. I use it to run my return as well as my skimmer and chiller. You'll be happy with that pump for a long time.