Care Level: Easy-Intermediate Temperament: Semi-aggressive Max Size: 6″ Light: Medium Temperature: 75°F to 81°F PH: 6.5-7.5 Genus: Epalzeorhynchos Species: E. frenatum If you’ve been involved in fishkeeping long enough and no longer consider yourself a beginner to the hobby and believe you are ready to add something a little more challenging. Then you should consider purchasing a Rainbow SharkThe Rainbow Shark. is distinct in both its personality and its appearance and is popular among intermediate fishkeepers. In this article, we’re going to be discussing the many things this breed has to offer, as well as talking you through everything you need to know in order to adequately care for one.