[softak]

One of them get all the tank, swimming around the tank.
Another one is sitting most of the time in the shell (some times going out, but when i am around, jumping inside).
Last one is hiding in rocks.

I am going to move rock little bit away from the wall and plaice there couple shells for the hiding one.
Will this help?

 

[softak]

One of them get all the tank, swimming around the tank.
Another one is sitting most of the time in the shell (some times going out, but when i am around, jumping inside).
Last one is hiding in rocks.

I am going to move rock little bit away from the wall and plaice there couple shells for the hiding one.
Will this help?

Should I move rocks and move some shells behind them?
Can you say their gender?

Fish hiding in the shell:

Boss:

Hiding in the rocks:

Aquarium:

 

[Charles]

One of them get all the tank, swimming around the tank.
Another one is sitting most of the time in the shell (some times going out, but when i am around, jumping inside).
Last one is hiding in rocks.

I am going to move rock little bit away from the wall and plaice there couple shells for the hiding one.
Will this help?

Try moving the rocks in the middle, then cluster some shells against the glass. Sounds like the one swimming around = most aggressive one; most likely a male. You can place the rock in the middle to break the line-of-sight and hopefully the other one will settle in.

 

[Multies]

and also, your shells seem to be awfully close to each other.
use rocks to break them up and sparcely scatter them.
you can do what charles said and use a cluster for each of them so they can choose.

 

[triscuit]

How many do you have and what size tank?

I had an aggressive male kill two other stapps in a 10 gal tank within 4 days of purchase. I thought a 10 gallon would be fine for quarantining juveniles, but I was sorely mistaken. The first death had its gill cover ripped off, and the second was swimming death spirals from an internal, invisible injury.

I recommend getting a group of at least 5 of these fish in a tank at least 24" long in order to mitigate aggression. I have heard many more successful stories than mine, so perhaps the above recommendations will work. Watch your tank carefully, and be prepared to remove the aggressor if needed.

 

[softak]

How many do you have and what size tank?

I had an aggressive male kill two other stapps in a 10 gal tank within 4 days of purchase. I thought a 10 gallon would be fine for quarantining juveniles, but I was sorely mistaken. The first death had its gill cover ripped off, and the second was swimming death spirals from an internal, invisible injury.

I recommend getting a group of at least 5 of these fish in a tank at least 24" long in order to mitigate aggression. I have heard many more successful stories than mine, so perhaps the above recommendations will work. Watch your tank carefully, and be prepared to remove the aggressor if needed.

It is 24" tank.
I have 3 of them there and will have soon 3 of the same size or 6 smaller.

Today they behave better and changed shells.
I've moved rocks on the middle of the aquarium and made 4 clusters of shells in corners.