Thanks everyone!

I'm thinking about moving my 10g from my bedroom into the computer room where my 20g sits and incorporating the same wc system. I'm pretty sure I can just "T" off the lines from the doser so that it performs wc's for both tanks. TYhe two tanks will be side by side so I don't think the added head pressure would be much of a problem. All I would need to do is up the dialy % of water that is changed.

By the way, my 10g has been sitting idle since I set it up over 6 months ago, lol. Think it's cycled yet? I'm thinking 150w mh w/ phoenix 14k (already have it) over the 10g and all SPS. Should be fun!