I agree with Mark. 10g severely limits what you can do. Sounds like you're wanting a Sump & a Fuge. I have a 29g Sump Only and with just baffles and equipment it's full. Then I added a Custom Built 15g Fuge that feeds into the Sump's return chamber.
Try to see how much room you have under the stand and fit as much tank in there as is practical. Make sure whatever you design will it INTO the tank. Just because the footprint under there will allow it doesn't mean it will fit through the opening into the cabinet. Maybe if one larger tank wont fit you can do a couple of smaller ones (makes the plumbing more difficult but gives you more options).
Remember the rule of thumb here.....
The solution to pollution is DILUTION!
Just like with Hot Rods...
"The is NO substitute for Cubic Inches..."
and contrary to what some "reefers" say....
Size DOES matter 
How much sand do you have?
How much Live Rock? The Live Rock will populate with pods which will HELP feed the mandarin but that's a LONG way down the road. Right now we need to concentrate on the optimal/functional set-up and let the tank mature into a Pod Producer.