Thank you for all the nice comments. Thanks BRS and all the members sold me stuff.
Ultimate, I want 120G tank but I don't have room. I love this 75 (not too big nor too small) comparing to the 55G. Extra 6" depth give me lot of space to work with and the tank is drilled. My equipments are old and low tech. I am try to reuse everythings I have as long as they do their job.
Here is a list of equipments:
1. Tank - 75G drilled 4 holes (bought this from a member here) - I connected all four together as drain, return over the tank for less amount water return to the sump in case outtage.
2. Sump/Refugium - 20 L, no baffles. I use bottom half of a white water container placing in the middle as refugium section.
3. Light - Old Hamilton Metal halide system with magnetic ballast (I am using cheap bulbs Plusrite 14K)
with DIY 4x54W T5 (Actinic bulbs)
4. Return
QuietOne 2200 as main
QuietOne 1200 for Chiller connecting from sump to DT
Circulation
Hagen Powerhead 802 (like 10 yrs old)
Maxijet 1200 and another small powerhead
5. GFO/Carbon reactor - built using RO system spare parts (connecting from sump to DT)
6. Old Deltec TS1250 Turbo skimmer (bought from a memeber here)
7. ATO - basic 2 switches
I will take a picture inside the tank and post.