Scooter Blenny Agression?

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ianryd

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I have 2 Scooter Blennies (Dragonettes) in my 75 gallon mixed reef. One red and one brown/sand colored. The Brown is bigger, about 3" and has been in the tank longer. I added the red one several months ago when it was quite small, and now it is just over an inch long. For the most part they have left each other alone. Today I noticed them following each other around the tank and displaying their dorsal fins towards each other and slapping at one another with their tails and fins. So are they just establishing dominance now that the red one is getting bigger? Can they hurt each other? Should I separate them? Anybody ever see this behavior in their Dragonettes? I would take some video but my lights are pretty low right now.
 
That sounds as though you added a juvinile male to a tank with a adult male and you are now seeing aggression as it has matured. Dragonets do fight and can be quite rough, so I'd double check that it is a male first and then think about removing one and swapping it for a girl if it is.
 
That sounds as though you added a juvinile male to a tank with a adult male and you are now seeing aggression as it has matured. Dragonets do fight and can be quite rough, so I'd double check that it is a male first and then think about removing one and swapping it for a girl if it is.
Ok thats what I thought. Is it possible to determine the sex of them as juveniles?
 
Ok thats what I thought. Is it possible to determine the sex of them as juveniles?

It depends on how small they are commonly availablewhere you are. Here they are normally of a size where it's easy to tell. I'd just pick up a known female.
 
How do you sex scooters? Is it similar to how mandy's are sexed? The dorsal "spine" is longer and pointed in a male?

With most scooters the male has a really impressive and colourful sail like dorsal, whereas the female has a duller small dorsal. The difference is normally much larger than in mandarins ime.
 

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