Does anyone know how reliable the dorsal fin check is? I've read that the rounded dorsal fin means female and pointed means male. My two fish have fins exactly like the ones in each of the photos on SeriouslyFish's page - which would mean one male, one female. On SF though, they say that checking the fins is not always a reliable way to tell. What are the chances a male has rounded fins and a female has pointed fins or vice versa?