I have a dottyback that is not suitable for this tank, it's being aggressive so I need to move it but I have no idea how to catch it. I never knew what fast little things dottys are! Any ideas?

I think it's probably virtually impossible to catch a dottyback with a net in a tank full of water and rocks to hide in. Have you tried a trap yet? Look up bottle traps if you haven't already, a lot of people catch hard to get fish this way.

nea7 wrote:Yes, the bottle trap works well. You might need to bait it, though. Mysis is a good bait to use.

I caught a wrasse this way once. Sometimes it takes several days so you might have to be patient. I appreciate that may be difficult though if it's being aggressive towards your other fish.

blenny wrote:Thanks, I'll try the bottle trap. It sounds promising.

Does it take awhile for them to trust the trap before they go into it - is that why it might take several days to really catch it?

Yes, your dotty might be suspicious of it since the trap will be a new thing in its environment. If it takes more than a week I would change things up though, like try a different food for bait, and go from there.