Unfortunately, most of us do not select the tank size for the ls we wish to keep. I believe everyone, myself included, bought a tank and then fill it with any coral we can lay hands on.
My advice to newbies would be get a shallow tank, preferably 2 ft length/width wise (height 1.5ft max) and use T5s or PC min. In this way you do not have to worry about insufficient light penetration at the same time wide surface area will allow cooling by fan easily. Such a dimension will also allow u to segregate the tanks area with LR so that you can experiment keeping aggresive corals.
Eventually, you will be more focused and plan your next tank with all the works!
In the event, you still wish to keep everything, then what the heck, go get all manner of tanks to suit the different needs but not many of us have that kind of luxury with $$$ and space.