It's tough to do Malawi cichlids in a 45 gallon.
If you only have 3 fish, it will be impossible.
Generally,
with Malawi cichlids you get less aggression if you crowd them.
Also you get less aggression if you put in 8 or more at a time,
and move the rocks around, and put in new water with the new fish.
Having many hiding places with different size entrances help...
for instance an assortment of PVC pipes.
A four foot tank is much better than a 3 foot tank.
You also get less aggression if you keep Malawi cichlids cool,
say 71 degrees F.
What is a "long neck"?
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