Concerned

[Perfectlap]

Do yourself a favor and have a leakdown and compression test performed. If it checks out get a new coolant tank and the most recent cap (important). Sometimes when the flush is done without the new cap, air gets into the tank because the old cap can no longer seal and you end up with small cracks in the tank. The coolant starts to leak and you have to do it all over again. Get the Porsche coolant (pink) and do not top it off with the Wal-Mart stuff, you will lose the special additives that protect. Or maybe you have a leak somewhere else. Also bad.
The coolant system in your car is not to be neglected unless you want to buy a new engine. Replace the water pump and thermostat if you're still on the original before you put any money into the car's appearance. According to the engine experts a new water pump should be installed every 3 years no matter the mileage. It's the key to keeping your engine alive.