Dad will not eat until the eggs have hatched which takes around 4-10 days and will then stay with the fry for 7-10 days after they hatch. Once the eggs have hatched he may or may not nip out to feed - mine never did until the fry left the cave. If you are putting courgette in keep an eye on it as if its not being eaten you dont want it to go off and make the water quality bad which could kill the fry.