Newbie advise needed... Diary of a new tank junkie

[ensquire]

Thanks
I do see new growth on the rock which is very encouraging as I have a nice looking reef design going on. Since this is my first sump , I will do some more reading on here.
I have a couple of concerns. first of all, there is a single drain and return and I see the danger in this so I suppose that when I break it down I should add another drain. Where does a person get the bits or do most take the tank to a glass shop and have them do it ?
My return line has 2 elbows in it , does this stress the pump ?

Once again all advise welcome