When I was shopping for my anthias I had the same questions. I think they are being a bit over conservative myself, but I still think 3 of them plus what you got might be too many. You wouldnt be able to add anything else for sure and anthias arent the easiest fish to keep. I lost my squareback, he apparently just stopped eating. They arent real big on prepared foods....
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.