Lately my corydoras have been laying like crazy, unfortunately most of their eggs have fallen prey to my female guppy and kribensis. Although I have saved 3 eggs. They are in a floating hatchery in the path of my spraybar. Today is day 1. Anything I need to do? I am planning on feeding them hikari first bites and ground nutrafin max bottom feeder pellets. Do they need an airstone?