For a 50g I would be looking at other options, the tunze I picked up is for a 155g tank. LOL I only got it cause of its size as it has to fit into a 16g tank.
Have you looked at the reef octopus skimmers? Or even the eshopps psk 100?
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.