I agree with Natalie on this. The OP only stated that his fish was showing signs of a hump, not that he was going to grow a huge hump. So I doubt he will be upset if it doesn't grow extremely huge. There is a clear difference between Koks of Flowerhorns and Nauchal Humps of other cichlids. Temperature, maturity, hierarchy, diet, water parameters, and genetics all contribute to the size of Nauchal Humps. There have been plenty of threads about this with people that have posted pics of mature Midas/RD that were purchsed with little to no humps, but after a while with quality care their humps grew dramatically. You can't always look at a picture of a newly introduced fish and assume how it will look as an adult.