I also have a 65 gallon tank of that shape. I think you will do better if you use a canister filter, even a cheaper one. I was never happy using one of those AquaClear hang on back filters.
The light you chose is very good for low light. From Finnex RAY II & FugeRAY PAR Data
It will cover the whole substrate pretty uniformly. You might find that the plants will grow towards the light, so moving the light from front to back occasionally may be necessary to discourage that.
If the sunlight in the room includes direct sun light, you will likely run into algae problems, even with low light. If you can avoid any direct sun light it should work well.