They're golden ancistrus. All of them born here in Baker St. Males have huge whiskers, which some females apparently find extremely attractive

The male digs a cave – they are prodigious diggers, they can keep you up all night with the noise – which if the female finds to her liking, she’ll then lay in. The male then takes over completely, nursing the eggs and finning them to ensure a constant flow of water so they don’t go mouldy. Meanwhile, the female is off gallivanting somewhere else

The babies are very cute, good swimmers, a talent they gradually lose as they get older. Courgettes seems to be their fave food!