are red tail sharks gender specific

I really enjoy my red tails and I was wondering if red tails are gender specific and if so how can you tell them a part
 
Males have a right angle in the tip of the dorsal fin. Females do not have the right angle. Their dorsal will come straight back, more like one side of a triangle.
 
I have just got a red tail. I asked the bloke for two but he gave me one rainbow shark as well have heard it could be a problem having a rainbow in with the red tail and also blacksharks which I have aswell.
Any advice?
 

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