It's properly "Rikkia" but lots of people say "Rissia" or "Riksia". As a general rule C's in scientific names are pronounced like a K; so are CH's. So the peacock bass genus Cichla is pronounced "Kikla", and the family of which it is the type is pronounced "Kiklidae".
Cichlidae is pronounced 'Sick-lid-ee'
The first 'c' sounds like an 's', not a 'k'.
'ae' in scientific names sound like 'ee'
Felidae, canidae, etc.