I would add slowly, maybe the tangs at once then a few weeks later the gobies. A tomini is a tang.
Dosing is adding trace elements that your corals will hog up when you get enough of them lol
With those lights you can pretty much add most things. And yes, hammers, torch corals and others like that will be fine.
Just make sure your water is totally stable before adding anything. I know you just setup this bad boy recently so slow is the way to go.
With corals, as long as you have stable water you cna add several at a time if you like. I would start with the easy ones, like shrooms
and zooas maybe a nice flowy leather coral....