Helping out in posting. Owner tested and working. Total got 5 units. Though rated 1/2 hp but basing on past reviews, think safer to think it can support max 4ft/400l tank. Do quote yr offer and you choose to.test and select among the 5 units. Viewing at seletar area. Ty.
They have one in the display tank where all the corals open nicely, very stable and selling. That tank, they change water like twice a week. Livestocks inside are very stable. Just ask auntie. All the best.