I started with a cube myself and still run it today!! I use it as my full sps tank now and it's been moded beyond belief which is something that I'm sure you'll fall victim to. Starting off since you don't have fish or live rock in there yet I'd remove the bioballs and get the intank media rack and go with filter floss, Chemi pure and later some phosphate media... you can even thow the balls you bought in there for now they will help for sure. As far as lighting, I was able to grow all the lps and softies I wanted with them even acans up high!! Your best friend in this tank is gonna be 5 gallon weekly water changes, I'm 4 years in now and ignored that for the longest time and tried to fight issues with reactors and other additives but now I run no skimmer, a media reactor with phosguard, hoodless with custom top, reef radiance leds, chemi pure and 5g change a week and have a thriving mixed reef that people love more than my 120g a lot of the time... Rutien changes and research are gonna be your biggest help towards success with this tank coming from a guy that made all the rookie mistakes!! I even have had a harlequin serpent star for 2+ years now so everything is doable just listen to advice and take things one step at a time