I assume since it's the 13.5 you may have limited filtration, I'd be careful with "feeding" it can lead to months of needing to remove nutrients and algae outbreaks.
imo if you can get a reliable test (for example Hannah ulr phosphate and hr nitrate checkers) I would dose liquid nitrates and phosphates to maintain a very low range of both, this will require a bit of testing daily for the first few days or weeks then you will have an idea of whats going on, you will probably be able to maintain levels without daily dosing and only fish the feeding.
I like to follow brightwell nenitro and neophos recommendations of "low nutrients" but you don't necessarily need to use that product although it's fine and what I prefer to use. then feed what your fish can consume like you originally were doing. I like to use pellets most often with the occasional frozen food cubes a couple times a week, i even use reef nutrition refrigerated foods.
if you have sand combined with lower filtration and less frequent maintenance, all that uneaten food can be an issue down the road and cause you to extend the "ugly" stage.
imo you really want to get a packed tank of healthy coral as quick as you can so when you do add N&P through dosing or feeding, they can quickly uptake them for you. feeding the tank/ the water column is different than feeding more cubes of food that the fish can't eat, that stuff gets lodged under rocks and settles under sand and with limited filtration can cause issues. dosing a small amount of N&P while monitoring levels is a clean way to insure they are always present in the system providing nutrients for all the microfauna and coral, once your system and new rock equalizes this may get much easier to maintain and requireless frequent testing.
