Deb-Are they kept 1 pair/tank?
Keep them well fed & let nature take its course. Of course, it might be the testosterone & estrogen I supplement their feed with

I've found that with many of my animals, if I keep them fat & happy, s*x is the next thing on their (my?) minds

Even my seahorses bred, although unable to save the babies. The shrimp are hermaphrodites & they'll usually release the eggs at 2:00 am (good thing I'm a night owl) & molt the next day. Usually within a day or two, they'll both have fertilized eggs again. Yum, yum for the other inhabitants. Sushi anyone?