I've been building a marine tank since getting out of freshwater last year.
Main tank is 110L, sump is 60L. I built My own stand, light, overflow box, screen for the top, sump baffling. Return pump is and eheim compact 1000, 2 x 1000Lph wavemakers. A 55W and a 150W heater.
The light has 3 channels of 12 LEDs each for 36 total. A blue, a white and a mixed channel.
Next step is to add rock and water, then cycle and get some livestock
Tank with lights full
Lights dimmed
Side View
The light with cooling fans, and Stainless steel or Aluminium hardware
Top View
Sump