I can only make a few suggestions. But here's what I think. As far as a skimmer goes vertex has been the best I have and currently using it. But I haven't tried a lot of brands, and this is the nicest of the ones I have tried. I would stick with LEDs. Does your sump have an are for a refugium? I would suggest a refugium an using miracle mud to cut down on your water changes. Not sure how large or how often they would need to be. I do 5 gallons per week on my 110. I would also suggest an
rodi unit, I have almost 5 gallons a week in evaporated water, and I would imagine you would have over double that with your tank size. I know I'm glad I got one. As far as return pump the minimum I've heard you want your tank to circulate is 5 times an hour. So the minimum
gph you would want your pump to push is 1500
gph and many swear by much more. Also depending on if your sump is behind a wall or below the tank or in the basement you want to watch your max head height. Hope this helps some. If anyone else has anything to ad or if I've gotten something wrong feel free to correct