I have a small number of young mbuna in a 55 gal tank for just over a week now and all has been well. I'd guess that each fish is about 1.25 to 1.5 inches long. I just placed an online order for 6 afra cobue. They are estimated to be about .75 inches. It never occured to me until just now that the cichlids already in the tank may be old enough to eat the new ones. Should I cancel my order? I think there is still time as they have not been shipped yet. Thanks!