I am thinking hybrid RESxBG with a heavy RES expression.
I'm guessing the same.
Both sides of the tab are the same. You can see the red but the margin is thinner than one would expect on a fish this size and it is partially covered by a thin layer of translucent black that further hides the red portion.
Is shows up a little better in real life than the picture but the red tab is still very marginal.
I have had trouble in pictures showing the tab border well at times. When the fish flares its gills, sometimes it changes the angle enough the margin does not show up very well in pictures. I find this often in GSF or GSF hybrids. When the gills are closed and the tab up against the body it shows well but if the fish flares its gills when I snap the picture the margin does not always show up well. The fish will just not always hold a pose for me.
Same thing goes for dorsal fin extension. If I remember I will lightly tap the fish on one side with one finger and the dorsal fin will extend for the picture. Of course that also can cause them to jump off the table onto the ground.
If there was just more of a red/orange margin it would be a picture perfect RES.
