So my dad is taking down his 20gal freshwater tank and I am going to take it and hopefully turn it into saltwater. I already have a reef so I was thinking of doing a FOWLR. I would like to do a Fu Manchu lionfish in their and possibly one other fish if I could. If I can do another fish, what would you suggest? And what equipment would you suggest buying? He just has the HOB filter that came with it. I would like to not do a sump for this one but will if you think it is absolutely needed.