Help!

[NanaReefer]

I recently bought 2 Yellowstriped Cardinals. Knowing my Yellowtail damsel would harass them for a bit, which he did for the first day. But today he/she has chilled.
What I didn't plan on was one Cardinal harassing the heck out of the other. This was not in their description! I feel horrible for the one being bullied :(

I'm thinking of a couple remedies. Return the bullied one to the LFS, return the aggressor to the LFS, purchase 1-2 more Cardinals of same.

My tank is a 40B. 1 Swalesi Swissguard Basslet, 1 Yellowtail Damsel & 2 Yellowstriped Cardinals.

 

[fishroomlady]

I might return the aggressor because it may continue to aggress toward other fish.

 

[eatbreakfast]

Cardinals can become intolerant of conspecifics of the same sex. You are better off returning one, but if you get a replacement the same thing may happen with the new fish as they are difficult to sex.

 

[Kostaskappa]

If you want to keep em both I'd say get two more. Other option is give back the aggressive one and stick with one!

 

[NanaReefer]

I'm now thinking that the aggressive Cardinal & my Damsel knew something wasn't right with the other. Sadly it died before I could do anything :(