I setup a Cory fry tank on Thursday and I put in a cycled sponge from my 75 to keep the water clean for the fry and cycle the tank. Well none of the eggs have hatched yet. Mega ing no ammonia source. It's very very odd since the parents laid the eggs last Sunday and no hatches to date, no they don't have fungus and yes they're fertile. I'm worried about loosing to much bacteria before the eggs hatch if they even do! Shod I add fish food to keep it cycled until they hatch or shouldn't I worry?