Couple of things with night fishing.....
Always try to go out before it gets dark to create a track on your graph to get you back to the ramp (if that is your intention). Your mind can play tricks on you when it is pitch black out there. As long as you follow what has been laid down, you should be ok.
Bring a spotlight for the trip back to the ramp, as some people go out totally dark, and could be in front of you.
As far as Alamo at night, I've had some really good trips out there in the summer. In the past I have always headed to the exposed trees past the buoy line and dropped lights there. Usually fishing in 15 to 25 FOW. I usually tight line with minnows, and/or cast a bobber. Most success came on the tight line rig. On my tight line rig I use a 1/8 oz bass casting sinker on the bottom with two loop knots above, spread apart about 18 inches. Bobber rig is a single hook with a split shot above. You may have to adjust depths, but once you find the fish, hang on.
Totally recommend lights, as they get the plankton and bait fish active to your boat. Usually, once that happens, the bigger fish come in. Good luck out there.