@Anirban and
@Diesel
Thanks.
When I went to the lfs yesterday, the man said for the sump, mandatory things to have would be only the scimmer. A refugium if I want as well.
See he is saying just this, and you guys are saying way more. See why I am confused?? Haha.
Well in that case I would stick to the advice of your LFS guy.
That's a no brainer to me.
If the skimmer is the only mandatory thing to have how do you get your water in the sump?
And how do you get it back in the tank.
Tank needs to be cycled for a month or longer and you need to test for the out come and what to do.
Once you are through the cycle period, you want fish and corals and you need to keep these alive.
So you need flow, and lights and food.
Fish poop in your tank so you need a filter sock and filter sock holder, if you feed to much your Po4 gets high but you don't know that without testing as you need a test kit for that.
Once you know your Po4 is high you need to bring it down, you can do a few water changes which you need to do any ways every week but you might need a reactor to help you with that.
Not to mention that fish can get sick so you need medicine or you lose your fish and that can happen in less than three day, worse case.
Oh and if your corals grow you can frag them and make a few $$$ of them as you can buy some fish food again or a new pump as you old pump is doing weird.
These are just facts and it would scare most newbies but my point is don't jump in the deep end and read, read, read and read some more, talk to other reefers as I'm not a nice guy to talk too

and do your home work on this hobby.
There are ppl that dropping 20k just like that on a build system that's not include fish and corals but they did at least their home work over the years.
I want YOU to be successful and I want you to be better than me in this hobby, one way to get there is following advice from hobbyist in this hobby.
You don't have to listen to me but listen to other, one day maybe we run into each other and you will or want me to do the High five