Why are blue green chromis' impossible to keep?

Can anyone answer me that? I have one guy left. My water is fine, they eat fine, I don't get it.

 

they tend to be a little stupider than most.

But I had 3 that lived for 5 years. I ended up killing them during a stupid dosing accident

 

my chromis used to kill each other the thing is that u need to put them all in at the same time and they all have to be the same size or they will kill each other.

 

I had trouble for a while keeping 6 in my 70 gallon....one by one they kept disappearing. I kept seeing my clown chase them around and thought they were jumping into my overflow, however I only ever found one in there. I thought maybe I wasn't feeding my fish enough which was making the clown aggressive. I increased the feeding amount and my group of 6 has been stable for a couple of months now. I can't say for sure that this is what helped, but no one has disappeared and my clown doesn't seem to bother them too much anymore.

Any other fish harrassing the chromis?

 

I started with 9 and an currently at 6

 

well i still have my 9 original ones.. its been about 4 weeks.. i think.. how long has anyone kept them with no problem?

 

I don't think any of my other fish harassed them.

 

I had 3 and killed them in a dosing accident as well. They have very high metabolisms and should be fed small meals several times a day.

 

My Maroon clown chases the 2 of 6 originals but never stresses them..they are like 9 months old....i had 5 in an larger tank that lived for 5 years and then I sold the house with the tank as it was built in.

How many did you start with?
Are your other fish doing ok?

 

We had 3 in a 14 biocube. All 3 died in a matter of weeks...but there's also a fully grown mantis in that tank so my scenario is invalid