I have several tangs and a bunch of other fish that really like the seaweed so I try to put it out every day. I use small pieces though so there isnt any "float" away parts.
I will put it out several times if the fish consume it quickly.
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.