I changed to the doughboy build on RC. Here is the one I have on my frag tank. I did not include everything he has on the build but It controls a chauvet 8 port relay. It has a web interface. It is a great build.....
A picture will be very helpful is recommendations. In general, if you are not using a check valve on the return line then it will back drain until it breaks siphon. I have a small hole drilled in the elbow above the surface to break siphon on my return.
I bought a 4" PVC from HD, drilled holes is in it, stood it up and the Filtter sock fits right on top. Then put the flex hose down into the sock. Works great. Search DIY PVC Sock holder. Lots of options
I originally was going for the dc3200 but there was a photographer in the store and recommended the 7000. He also recommended shooting both raw and jpeg. I found it so easy to revert back if needed when editing. Pick up a 3 tb usb for 80$ to transfer images to. Also recommended froknowsphoto.com videos. Also said to put in A mode to help learn technics in changing apertures.
Looks like they sold out of the pH, only have the ORP left. The newer pH are $34 but they are either serial or I2C.
http://www.ebay.com/itm/ORP-Circuit-Version-4-0-/201172728108?pt=LH_DefaultDomain_0&hash=item2ed6d4392c
I am building another of d0ughb0y's DIY controllers on RC.