I would run both into the skimmer chamber. If you do T, only divert a small amount to the ref. Low flow, no turbulence is the key. Esp if you take the above suggestion and put sand in there. If not, all that sand will get stirred up, into your pump and end up in the display. And do the durso's now, esp it you plan on T-ing. The back pressure is going to be up there.
Nice looking setup. Looks small for a 210.. Maybe God is tellin me somthing
Actually second thought, I would T it. In the end I may have everything going into the skimmer chamber but at least you have a choice without ripping it out. I wouldn't worry about bubbles after the skimmer baffles (unless you split the drain) IMO