09-11-2011, 11:55 AM
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I would not keep rams and kribs together. I would not mix cichlid species at all except in much larger aquaria (4+ feet length) and then only with carefully-selected species. Cichlids are very easy fish to spawn; if the tank is to their liking--which means the water parameters, stability, environment suit the fish species--they will spawn, repeatedly, no matter what. When defending eggs and fry, cichlids can be very rough on any other fish, even those considerably larger. I have some Apistogramma baenschi in my 4-foot 70g, one male with (now) 3 females, two of which are mature fry from the original pair's first spawn that managed to survive. The male spawns with any female who is willing. And in spite of the females being less than an inch, they are rough. And I mean, rough. With each other, and any fish that they perceive as being "too close." As soon as you mix species, this intensifies to the detriment of other fish in the tank. And kribs will kill other fish in their way, moreso than most other dwarf cichlids. The Rams are pretty feisty too, so this is not a good mix. A 30g (presumably 30-inch length, maybe 36) is insufficient for more than one species of dwarf. But even in one of your 55g I would not mix these two.
Understanding the science behind what is occurring in our tanks helps us avoid doing something that will have serious consequences. This hobby is a scientific one, and success comes easier from knowledge. After 20+ years in the hobby, I am still learning. When you have those numbers, I will try to put it in perspective.