Chromis Problem

adromero

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All my fish died in August which I believe was caused by dosing too much alkalinity at once. Since then I have been restocking my fish in a 34 gallon Red Sea170. I first added a blue chromis and now added a neon goby, a gold head sleeper goby, scissor tail dartfish, possum wrasse and recently added two ocellaris clownfish. Also, there is a shrimp goby that lives with a pistol shrimp that survived the fish die off. When my fish died all my corals, anemones and inverts besides the sexy shrimp survived.

The chromis has been hostile towards my dartfish and causes it to go into hiding. I also added a small lawnmower blenny about a month ago which the chromis would terrorize. I have not seen that fish in two weeks. I have a lid so I doubt the blenny jumped. I added the clownfish thinking they would dominant the chromis but the opposite happened. The clownfish stay under a rock and fight the chromis when they come out only to return under the rock.

I have tried to catch the chromis with a net, but he hides in the rock. I talked to an LFS about the situation and they said a chromis should not be aggressive. Another LFS suggested that by adding two other chromis my current one should be less aggressive.

I was wondering if anybody thinks adding more chromis would be a good idea or if anybody has any ideas on how to catch mine in my tank. I have a lot of coral which took me a while to grow and I wouldn’t want to start moving stuff. I’m afraid of breaking some sps. Also, is it possible this is not a chromis but another type of damselfish. I had three chromis in the past which were very peaceful. Any feedback would be appreciated.

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Chromis is a type of danselfish. As they become adults, they become aggressive. Without enough space and numbers to even out the aggressiveness, smaller less bold fish will be come victim to it.
Try a trap to get the chromis out. Do not feed it for a few days, then put all food in a net or trap (plastic bottle, acrylic trap, anything that it goes in and you can pull out fast or close fast. to get it out.
Also, that sounds like a lot of fish for a 34g tank. The sleeper gobies need a ton of sand for sifting and getting enough to eat. Same with the algae blenny. Needs lots rock and algae to keep happy. Just for thought.
Good luck. I hope you get the bugger out.
 
It looks like a chromis to me by your photos. Putting in a couple more might spread out the aggression . Another thing you could try is rearranging the rock work a little bit. Being in their for so long solo he has probably claimed the entire tank as his territory. If you change the rock work a bit it should reset the territory issues and start everyone off at square one.
 
What type of Chromis was this sold to you as. Looking at the pictures it doesn't look like a C. viridis type, it looks more like a C. cyanea but the scales and colours are wrong.

I honestly can't identify it. Given it's obvious aggression and lack of ID I would be very reluctant to put any more Chromis in.
 

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