Its not always the case, but sometimes hammers are more prone to produce sweepers if they are in a flow zone thats a little higher than they are accustom to. You might find less frequency if you place them in a more moderate flow zone, maybe not. In any case I would keep an eye on them. Euphyllia can pinch off sweepers that adhere to LR
or if water quality is bad and the free floating sweeper will do massive damage to other corals. Nothing to panic about, however keep your eye on it. Also if you pinch them off wear gloves!
Here's to swimmin with bowlegged women.
Reef with 30G Sump/Fuge Combo
-30G LTAnemonarium with mated porcelain crabs, 10 sexy shrimp, and 2 pink skunks all tied into the other 135G in my system.