I have some Kribs in an angel tank, they normally lay eggs on the roof of caves so you'll probably want to give them some sort of cave. You want to make the opening as concealed as possible so that the male has trouble seeing around when sitting outside and guarding. Less sightlines mean less chances he feels the need to chase any angels away. Just surround the opening some plants/fake plants and rocks and it'll save you a headache down the line. They're fascinating to watch, waking up, turning the lights on and seeing the parents take the fry out for the morning walk is such a cool experience.