[karimwassef]

any feedback on the concept and build?

I have some ideas to improve the flow in the scrubber.

Also, I really don't like the work involved in manually moving the algae to the DT to feed or collecting the "protein gel" in the sump to feed the corals. I'm thinking of adding a spray bar that removes the protein buildup around the edge.

I use the aux sump as a water change chamber too. I stop the circulation and separate it from the main sump with a valve. Then I evacuate the water in it to a sink (using a valve on the pump return usually flowing up into the scrubber). Then I add fresh water and salt to this section (has no life) and mix for a few hours before opening everything back up.

So these tanks serve a number of different functions in this setup.