Don’t worry about what the other guys said, your plan can work. Just get good filtration and that doesn’t mean spend more money. Simple appropriate sized sump/ skimmer, rock or bio blocks in sump. Some say not to but they have higher end options like filter rollers and auto test. Ur sump should be sectioned over flow into skimmer section, flow into chaeto (nutrient removal), if they rise just harvest for more room for new chaeto to up take said nutrients, then flows into return pump section. Add a clean up crew but remember to trip because your fish stop will snack on them. Just try it out, learn the system and behavior and come on here when you need help. Good luck bud