Trouble with fish compatibility - Beginner

[adamt12]

Hello! Here is my base line info on my problem.

New tank and I'm a first timer. 75 gallon

When the tank was cycled and ready I bought 3 yellow tail damsels....mainly bc they were cheap and I didnt want to kill a 50 dollar fish, just in case the tank wasnt as ready as I thought. All were happy, no problems

Added 2 bangai cardinals, bc my wife thought they were cool and I liked them as well. Compatibility seemed ok as well. And again not real expensive. And again everyone was happy, eating, swimming etc

Next tried a yellow tang, died within a day. Didnt think much of it, figured I made a mistake, petco was nice enough to get me a refund bc my water tested fine.

Then tried 2 clowns, 1 didnt make it.

The day after that my cardinals disappeared, saw little cardinal fin pieces left.

The second clown is fine and seems happy, though he hasnt really found himself a spot yet.

I am really watching these damsels closely and it appears they are picking at each other and I am guessing they stressed out my cardinals.

What can I do about this, I have read that if I add some coral before I add angel fish, that will help keep my coral safe...and I have also read angels may be able to keep those bullies in check as well. True, false?

Also, why would the damsels all of a sudden decide to pick on the cardinals when they were happy already for a couple of weeks?

 

[sfin52]

I've got three yellow tail damsels had them for month but they were the second to last fish. My royal gramma was the last. They are fine so far. The Gramma and cinnamon clown have kept all in check. They have left the benghi cardnial alone.

 

[sfin52]

I've got three yellow tail damsels had them for month but they were the second to last fish. My royal gramma was the last. They are fine so far. The Gramma and cinnamon clown have kept all in check. They have left the benghi cardnial alone.