yeah everthing was fine with out the severum but when the pike and the EBJD and sal x fm meet they don't like the pike. And the sal x fm just got done trying to lay eggs but the EBJD ate them.FIN01;4050999; said:I don't think your aggression is due to overstocking. Maybe the sal x fm is just overly aggressive and it's asserting itself now. I hate needing to find a regulator of some sort. Is the sal x fm a problem with the others if you don't have the sev? If not then leave the tank be without a severum. I agree with others a upgrade should happen, but further down the road. What kind of pike do you have? There is a lot of variation in temperment and size amoungst the pikes.