When I kept african cichlids, one would occasionally spit out a bunch of babies in my main tank before I could catch and strip "Mom", so I periodically had to catch and remove juvies from the tank to sell.... those suckers are as difficult to catch as any slick damsel.... the method that worked best for me (With a little patience) was to fill and sink a plastic bottle (water or coke bottle)with a bit of food in it as bait. Invert the top of the opening, I usually just cut the top off about 2 inches down and turned it around tucked snugly in the bottle to form a funnel. The smell of the food will attract them into the bottle and once in they can be easily removed.