Interesting. I had mine in a fairly tight holder but they still shifted. He will be running about 3 times as much flow as a 1262 too. Just something to ponder. I do agree your way would be quieter. I guess if you plan for the difference in water height it would work. Pm me if you have a pic. I'd be interested in seeing a side view of this in action if you ever get one. I hate to admit it but the behind the scene stuff is almost as exciting as the tank itself for me. Hmm I never considered the ato if the chambers don't stay constant and balanced. If you had a way of keeping the return chambers connected to each other so there's essentially a balance pipe I guess that would keep everything even and still allow you to have 2 return chambers for ease of plumbing. I agree OM's get tight fast.

Well it isnt you :razz: I have a closed loop on the 165 now and I dont like it because sand gets into the suction side and has damaged my 4way drum to the point that I cant use it until I replace it.

Not to mention the noise of a hammerhead pump terrible, also had one of these on my 165 and I could hear it up stairs in my bedroom. This is a low noise, low power consumption build.
ATO will have sensor in the smaller side to monitor the level and top it up balancing them both.

You asked for input you dork. :mrgreen:

Well that's just really poor design. :lol: Input should be up high or I've seen some people put them in the overflow box.

I think you will be disappointed in the flow of the DC10000 for the OMs. Or do you plan to add powerheads?

This sounds too complicated for me. What is the reason for two return chambers? Is there a reason to not use one return chamber? I don't understand the benefit.

I am not a dork :razz: respect your elders young lady :lol:


It the way the owner of Ocean Motion suggested I plumb it.

I do have 2 MP40's that I might use on the ends. I have a DC10000 on my 165 right now and very impressed at the flow rate & I have it running 2 - 1" return line just like it would be on the 4way ( 2 lines at a time )

Try to plumb 2 of these in one small area, keep all your return lines relitively the same length & as short as possible to minimize head loss, not to mention as need ad possible as well.

http://i765.photobucket.com/albums/x...ps78544001.jpg

Could do it this way as well, just have to have room for an ATO tank and my skimmer under the main tank. Chiller is going under the cabinet tower on the one end & the other end tower will have my dosing chambers and chiller for my 60 gal seahorse tank that will be beside the 300.

http://i765.photobucket.com/albums/x...psb29fb3d3.jpg

I like the above layout much better. So...is OM replacing your drum for free?

Never asked as its been a couple yrs since I bought it.

I am also thinking it might be easier to switch out the 4ways to squids if I can find them.

SCWDs steal 30% of the flow to operate though.

Been reading about them for the last few hrs & have not seen that mentioned any where, show me.