Knight Goby Question

[chris_1127]

just a quick q re my knight gobies; so far most of what i have read cites the sexual difference as the length of the front dorsal, but just wanted to check with other knight goby owners if theyve noticed any colour difference between the dorsal fin in male and female knights? my male has a bright yellow streak on his dorsal fins, but the two females I have both have blue streaks in theirs. The male and females both came from different batches - is it normal for the colour to vary or is it just down to them possibly being different strains or something?

 

[penguinpimp1990]

knight gobies

and its normal for a little color variation

 

[Flumpus]

Mine's the opposite, female is yellow, and male is blue. I thought that's what it was supposed to be... I've been known to be wrong before though