Advice on re-introducing clownfish

mpatterson42

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I currently have one of my two clownfish in the refugium sump for bullying my other clownfish, I'm looking for advice on how (and if) I should put him back in the display tank.

I got a percula (Cheeto) and darwin (Pepper) clownfish last December. They were both very small when I got them. They were the first two fish in my 40 gallon tank with 20 gallon sump. Since the moment I put them in they were always together. There was always a little aggression between the two, but after a little fight they'd always go back to swimming together. I was expecting Cheeto to turn into a female, they were always the one who seemed to be the aggressor and was getting a little bigger than Pepper.

I've added several other fishes to the tank (firefish, royal gramma, starry blenny, blue spotted puffer, mandarin dragonet) since then and the clownfish don't care about any of them at all.

Starting about a month ago things changed, Pepper seemed to be the one who was being aggressive to Cheeto and was starting to get bigger than Pepper. A few weeks ago I saw Pepper chasing Cheeto around the tank non stop. It got to the point where Cheeto began hiding in the bottom of the rocks, but Pepper would seek him out and start chasing him again. Cheeto was still eating when I put food in so I just figured they were working things out between them. Last weekend I was watching both after feeding and I saw Pepper bite Cheeto's abdomen and start dragging him around the tank. I turned off all the pumps, took the lid off and spent a good hour trying to catch Pepper but they kept getting away in the rock work. Cheeto came out during this time and started swimming with Pepper so I was hoping maybe things would calm down.

Yesterday I noticed Cheeto didn't come out at all during feeding time and I was really worried and not sure what I would do. Then after all the food was gone Cheeto came out and he looked terrible. He was shedding his slime coat like crazy, he looked like a ghost, I knew if I didn't get him out he was going to die. I ended up removing about 80% of the aquascape from the tank (upsetting all the fish in the process) but I was finally able to capture Pepper and I put him in the refugium section of my sump.

I'm not sure what to do now, I've seen people mentioning separating the fish for about a week and then adding them back in and that will reset their aggression, but I'm terrified Pepper will go after Cheeto again and kill him. I do have an acclimation box as well, I could do a week in the sump and a week in the tank and see what things are like, but what if everything is fine until I release Pepper and they go after Cheeto ago? I'll probably have to take my whole tank apart again if I want to catch him.

An advise is appreciated!
 

exnisstech

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That's what can happen when two small clowns are added together. They will either figure it out or you end up with a single clown. It's just how it can work out. Im a fan of keeping a single untill it transitions then adding a small male.

EDIT: My current pair I did a little different. I went to a lfs that had a tank full and picked the meanest most aggressive one in the group. I added that one and a few days later went to a different lfs and bought the smallest least aggressive one out of a group and added it. It only been 8 months but they are exhibiting paired behaviour with no aggression.
 
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tbrown

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Sounds like both decided they want to be the female. Reintroduction can happen with an acclimation box potentially but if they're both being jerks they may never accept each other.

Unfortunately with clownfish it's a win some/lose some.
 

Lasse

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Here is some tips how I add a new clown into my 80 G with help of an acclimation box . It good that you took out the aggressor - it make next try a little easier. But take time - let Cheeto recover and let him/her establish its own territory. When you introduce Pepper again - let him/her be in the box for at least 2 weeks and see what´s happens. As other have said - there is no guaranty that it will work out but this is the way I wouls have done





Sincerely Lasse
 
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mpatterson42

mpatterson42

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Thanks everyone, I appreciate the feedback, very cool videos @Lasse!

I think I'm going to do 3 weeks in the sump followed by a week in an acclimation box and see how they're behaving. One thing that does worry me is that the times when I try and intervene between Pepper and Cheeto, Cheeto will go back to Pepper and swim around and they'll be fine for a few minutes and then Pepper will go back to bullying Cheeto. But I'm hoping it will all work out!

Battle damage:
cheeto01_20250901.JPG


cheeto02_20250901.JPG



The condemned:
pepper01_20250901.JPG
 
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mpatterson42

mpatterson42

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Probation begins. Cheeto very quickly went over to where Pepper was in the acclimation box and is hanging out. I've seen a few "lunging" actions by Pepper but I'm hoping she chills.





Cheeto: Let me love you.

Pepper: Let me murder you.
 

Lasse

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Let Pepper be in the box for a week or two. When you let him out - do it just before the aquarium get dark.

My two clowns today



Sincerely Lasse
 
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mpatterson42

mpatterson42

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Yesterday I released Pepper back into the tank. She seemed a little hesitant to leave the box but eventually swam out. Cheeto greeted her, they did a slow tour around the tank (with some rockwork changes) and the other fish came out to say hello. I'm happy to report I've seen no signs of aggression between Pepper and Cheeto. There have been a few quick fish kisses but they don't stay locked up. All in all everything is going great, I hope it stays this way!
 

Lasse

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Yesterday I released Pepper back into the tank. She seemed a little hesitant to leave the box but eventually swam out. Cheeto greeted her, they did a slow tour around the tank (with some rockwork changes) and the other fish came out to say hello. I'm happy to report I've seen no signs of aggression between Pepper and Cheeto. There have been a few quick fish kisses but they don't stay locked up. All in all everything is going great, I hope it stays this way!
Any updates?

Sincerely Lasse
 

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