54 gallon bowfront over here!!!hello my friend i think i know what your going through and i may have a long term solution for you that has in fact worked very well for me , it is the ai solution led lighting system, i have a corner tank bowfront 54 as well and i had i friend make me a bracket that floats the light over my tank 13 inches and the light gives me optimal lighting !! .
i just started and was informed by my brother about the led lights and i now have a 2month old tank that has great lighting throughout the day as well as night without me touching the controller , yes it is automatic, the ai sol is great for all types of aquarium life its a bit costly around the 600 price range but its backed by a great warranty and it pays for itself in just a few years and a big bonus is that it does not cause any increase in water temp! , so if you can get your hands on one unit , it is a tiny thing in comparison but it puts out lighting like a giant!!, i hope this helps i will post pics if you wanna see it in action.
p.s. i had the bracket made from a friend in the welding business, i took off the glass top as it only promotes salt creep , just leave it open and maybe have a custom pond netting made if you have kids.