The TM bio-actif seems to get scummy if you let it circulate in the reservoir for too long. I'd be afraid to let 200g go scummy and waste the carbon dosing element as bacteria in the reservoir consume it. I could add UV I guess... Smaller batches (50-100g) seemed like a good idea.

I'm not worried about the actual AWC automation (aside from siphoning), more so the making actual sw automation. Some elaborate scale or hopper that adds salt to water, etc. That's an unwanted bit of automation for me.

When I am planning I may call you to come check it out and put in your 10 cents :)

Some new pictures :)

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Lookin good Scott! I hate photo quoting, but you posted so many...

What's this one? You have a shot of it top down too...
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Bonsai valida Acropora from Coral Masters.

Here is what I have come up with. Tanks are 24 x 30 x 24. I'd also like a spot for the JG float valve drilled in the top edge of the upper sump for the fresh RODI. Bulkheads are 3/4" I'd want tops to keep contaminants out but would need it to be easy to add salt (to the bottom reservoir). Also there would be some level sensors and piping coming out of the top of the bottom sump, sending clean SW to the main tank. I'd want styro on the bottoms of the tanks as well.

http://www.lithicimages.com/photos/i...8LhCHHf-XL.jpg