Size of the fry dep[ends on how protective the parents are. Julies or Neolamp's that guard their fry closely aren't likely to lose many/any to comp's. If the fry are left on their own to wander the tank they're more likely to get picked off. Even then, 1" comp's aren't going to be too much of a threat, and the leleupi fry will grow faster than they will.
A 55 is too small for Cyp's, even the smallest need at least a 75, really should
be a 6' or larger tank though. Paracyp's would fit alright, they're more rock-oriented than Cyp's, and prefer tall, vertical rocks around the sides and back.