Problems with Glofish?

[jonny1982]

I found one of my guppies dead this morning and he was healthy as can be last night. I suspect foul play was involved. I have a funny feeling he was murdered by one of my 2 glofish. Has anyone ever had any problems with Glofish? I read that they are peaceful, but they seem kind of mean (1 more than the other).

Thanks

 

[Penguin]

I don't think they are aggressive but you should definitely up the number of Glofish to at least 10 because they are schooling fish and if you add more of its kind it will divert the aggression to the other members of the school