I would make a perforation in the side and place a sump of between 60-80 liters, a simple sump with a section for mechanical filtration, another section for the skimmer and another section for the return pump, you do not need more to keep only fish, unless you want to fit a UV filter. In the main tank you will need between 30/40 lbs of aragonite or sand, I always recommend the live sand from natures ocean or caribsea, in addition to being aesthetically unbeatable, it will also help with cycling. I recommend dry rock to start maybe 20 or 30 pounds, it depends on the aquascape you want to make but not less than that amount, you can opt for the real reef rock which is dry rock but quite nice looking, and as for the circulation of water you can opt for a wave generator from the jebao brand, which are cheap and according to several reviews, they do their job well. An option can be jebao SDW-5, you can lower or raise the intensity of the generator with the controller, you can also go for a bigger model, or if you want a luxury option you can opt for Vortech mp10. As for the return pump, Jebao dcp3000 should work well for you, as well as the Bubble magus c3.5 skimmer should be more than enough, although you can go with a smaller skimmer and help yourself with more frequent water changes depending on the conditions. needs demanded by the water in your tank.