Haha, Didnt even know about scats till your post but I didnt mention them in my reply because I found this by Bob Fenner....C & P
Scats get along with all fishes bigger than their mouths and are generally not bothered by others, with one exception... other scats. Take care to assess the degree of bullying, such that it never goes too far; that scat-tankmates don't get physically beat or starved.
Seeming antithetical to the above, scats are social animals, almost always found in close association with conspecifics, and of endless observable fun in groups in aquariums. If space allows, definitely try a small, odd number of a single or mixed species together.
HTH, and the Damsel IMO is no problem too.