Hello SJN.

When you start turbines and it is dark it will always look like that and this is no problem at all. it is great running turbines at night just remember you will see light glowing red at just 500 C.

If you start a turbine with some fuel left in the bottom of turbine there will always be flames at the right or left lower part of the exhaust depending of the rotation direction of the actual turbine.
a wet start like this is not a problem for the turbine, with the number of cycles we put in to turbines in model airplanes it will not have any effect on the living time of your turbine at all.

The Fadec will allow a start to continue under the following conditions, the temp must not be over 800C for more that 5 sec and there have to be a constant positive RPM at a pre programed rate

So Just have fun

Best regards

Lars @ home with the influenza.
SimJet