8 gallon

[rudy]

Well, got the aggression figured out!
I was looking on the net and identified it as a magenta, not orchid.
(Pseudochromis porphyreus)

I guess he will be living solitary...unless shrimp are o.k. with them?

[Beverly]

I haven't actually had a dotty back, so I'm not 100% sure a shrimp would be okay with one. However, I don't think dotty backs eat shrimp. I hope someone with experience in this area will speak up with the right answer

[christyf5]

Likely he will eat the shrimp, or just pick its legs off If you do try a shrimp make sure its a big one.

With the tank being so small, likely he'll be living on his own from now on. Most other small fishes for a nano are too docile to put in with a dottyback.

[Tostito]

I had a shrimp and a purpledotty back in my 6 gallon nano. The dottyback bullied my shrimp, who had been living in the tank much longer, and I eventually riped apart the tank to get the dottyback out.