AFRICAN CICHLID LOCKING LIPS

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Remove and rehome one or the other. They are too closely related (both Metriaclima) to be in a tank together when you have one of each (mostly).

They are fighting and that is predictable so it may get worse and is not likely to get better.

When you have more than 3 species in a 55G tank you want to shoot for one of each and no look-alikes and all the same gender. Most people choose males because they tend to be more colorful.

Shoot for 8 - 10 individuals in the tank for the all one gender stock plan.

As the fish cause trouble you can rehome. How small are the new ones...mbuna can spawn as small as 2" and count the tail when measuring.

The three white albinos are likely to be an issue too.

The bumblebee (crabro) may become to big/aggressive for the 55G, they work better in a 48" x 18" 75G tank.

Very helpful information, thanks!..of course I have a million more questions..the 6 adult cichlid I mentioned had lived together in a 30 gallon tank for a year with no issues before I got them...it was a our general feed store in town and he had them in a tank with just water..no rocks, hiding places..etc, so I wonder if that may be one reason why they are starting to show more aggression?..because in my tank there's nice little caves and rocks and places for them to make home?...also, I am very confused about the quantity discussion...I have read so many different opinions on it...some say...only 3 cichlids for a 55 gallon tank..any more than that you are pushing it...but then I read a lot about slighty overstocking to reduced aggression...the ones I bought yesterday are about 1 inch and one didn't make it ...dead this morning...I hear you you said about the bumblebee Cichlid, yes, I have plans to purchase another tank to eventually move him...

It depends on the cichlid. An Oscar might be one/75G tank. You have African Rift Lake cichlids from Lake Malawi and specifically mbuna.

The first year of their lives they are maturing and there can be more play than aggression.

In an all-male tank 8-10 is the right level of crowding to manage aggression. For mixed gender in a 55G you would think in terms of 15 fish (3 species and 3 males).

Some believe no décor reduces aggression, not sure I believe that but in any case I prefer to manage aggression by stocking fish likely to ignore each other.

Any time you change their environment (their tank) the pecking order can change and aggression is a part of that. Occasional lip locking is not a problem, but if the fish doing the fighting are the same genus or look alike, may as well act now.