I'm interested in converting my freshwater community tank into a Tangayika cichlid tank. All of my fish are for sale aside from a rainbow shark that has a lot of sentimental value for my wife and I (it's moved around with us and is 3 years old). Can I mix him with Tangayika cichlids in a high pH (9-9.4) if I acclimate him well? Or do I need to get him his own tank?