Hi, I'm planning on getting a centre piece pair of fish for my tetra based community tank. I've cut out angels, looked at some beautiful kribensis but heard they will get aggressive if they breed. True? I have also cut out German blue rams because they are not for beginners, like myself. I would prefer a pair of fish that are about 4-7 long, peaceful, and will be happy in a pair. If the kribensis will be peaceful and leave other fish alone they would be great, I just know very little about them. Thanks