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Cichlids overcrowding good or bad?

23 15:34:58

Question

a few of the fish
Hi I have a 40 gallon bow tank, with 8 cichlids, I had 10 originally but two died off as they were large and older. I also have a "multi" synidontis, who makes a great tank mate for my cichlids. currently we have a venustus, a electric yellow, a sunshine peacock, and 5 tank bred fish that are cross bred from a "kenyi-ice blue zebra mix" and the father is either a yellow bumble bee or some other yellow cichlid.. lol sorry were not really sure who it was.. anyway, since the two larger fish died, our others have become progressively dominant and aggressive, i have heard allot about "controlled overcrowding" settling down this behavior. however the local aquariumists disagree.. I have read allot on line and it seem people go with over crowding to promote schooling? is this effective? i understand that if i choose to do this that there are always risks of death and water fowling, but would this be a good route to go with? we are looking add a little more vibrancy to our tank, but also to calm down some of the commotion in it as well. oh sorry, all fish are between 2 and 4 inches long. so by the inch per gallon rule i see i still have around 10 inches of "fish" to play with haha. thanks for you time!
Ken
Canada
P.s. in the posted picture you can see my venustus, and a few of the crosbreeds, notice one is an orange-blue? and the others are blue and striped, the all turn this orangish color. any thoughts? on species?

Answer
Cichlids are so cross-bred it is hard to get a definite on species unless you know the breeder, or you are buying true bloods, which cost a pretty penny.  Two things about cichlids:  One, there is always the chance of one fish becoming a bully and taking out the whole tank. Two, you can never predict how two or for that matter 10 fish are going to get along- short or long term.  The trick is if you are going to add more fish, you need to add several at once and they absolutely need to be the same size as the ones you currently have.  When you go to add new fish take out all the decor and move it around so that no one has their established territory, it may even be a good idea to add even more places to hide/set up territory.  Adding more than one fish at once insures that one fish isn't getting all the aggression from everyone else.  This will be harmonious while they are still on the smaller size, but once they start getting 3.5 inches and larger, one of two things will occur:  they will have established their pecking order and everything will be good, or you will come back with serious aggression.