Rhinogobius aggressive ?

[joren]

Recently I purchased a group of 8 of these little guys.
At first they seemed calm and friendly like my other fish, after a closer view you could immediatly tell that they are anything but shy however.
Having them a few days I start noticing them being a little aggressive though, attacking some of my other fish (nannostromus marginatus).
(The bigger fish like regular ancistrus, ... and the corydoras pygmaeus however are left alone)

I do understand that some aggression contributes to the normal tanklife but the that makes me actually worried is the fact that I notice them killing my beloved assassin snails.
Has anyone of you guys noticed rhinogobius sp. killing snails or attacking fish in an aggressive way because intenet states them being friendly towards other fish.

* Sorry for the bad written language, it has been a while since I last wrote something in English

[plaalye]

Which species of rhinogobius is it? Some are very aggressive and will eat anything that will fit in their mouth.

[joren]

They were listed Rhinogobius sp. but the names at the fishshop where I got them are not always the wright ones.
They look like the common Duospilus or a similar kind of Rhnogobius to me.

[starsplitter7]

Any chance of posting a picture? Do you have another tank where you can put your assassins until you figure it out?

Because I am nosey , where are you from? I am German living in Florida.

[plaalye]

Have a look here Joren.

http://ferraqua.de/

[joren]

Some photo's ( not great,I know ) :









@starsplitter7 : I'm from Belgium

For the moment I'm leaving them in the tank since it actually was one time that I saw one attacking a snail and the has survived it.
They also don't attack the other fish anymore, I'm guessing it was a more defensive atitude as they were only two days in the tank yet.

[ClownLoachSharky]

thats a sweet bristlenose pleco you got there

[joren]

thats a sweet bristlenose pleco you got there

Since today he's guarding eggs btw

[Batch]

Most gobies are at least somewhat aggresive. I've kept Rhinogobies with larger loaches (yo-yos) and Barbs. Putting them in with pencil-fish??
Not sure the gobies can catch them... Snails/shrimp are likely food for these guys.

batch

[Ferrika]

I know, this Post is a little bit older, but I want write something about this Rhinogobius, because they are not on my site until today.

This Species are R. ponkouensis. In my they wasn't more aggressive than other species into the duospilus-similars. But one of my users from Grundelforum reported that they were also very aggressive with him. They even have bitten out an Oryzia an eye. Why they are so aggressive in some cases, however, I know not yet.

Greetings

Jutta