I want to plumb a spare 10gal I have into my current system. I don’t need anymore then a 200gph overflow box because more then likely it’ll be less then 100gph I’ll have circulating. I couldn’t find any answers other then to have someone build. Is there such thing as an overflow box that small premade? I guess I did see a combo for a overflow and return but I don’t wanna spend $100 when I can find the individual parts and do it much cheaper. I want a Euphyllia garden hopefully