I changed my coolant after I did the timing belt, at the auto store the guy gave me Zerex G-05. It was clear in color, I went 50/50 with distilled water. Is that ok? Do I need to add any sca additives or anything?

Yes it's exactly what you need (if you look really carefully against a white background it actually is very slightly pink) and no don't even think about adding anything.

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Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs