you now I have been keeping fish for over 30 years and you think you no a little something . but some times WOW,I have a new 75 gallon tank I said I wat to grow out som Electric Blue Jack Demsey,s so local fish store ran a special on fish 50% of all freshwater fish with a coupon. so I got 4 blue Jack Demsy and a Belly Crawler pike, FireMouth and Keyhole. all around 3 inches all is good for 3 days the Keyhole started beatin up all the jacks tail spit fins torn then all of a sudden 2 more days go by then the Firemouth started with every one. the Keyhole is being beat up nobody touches the Pike. he is king I changed the tank around and added plants more caves a Hopola catfish 4 inches and a bushynose pleco 4 inches then they started to get beat up also I just took the to mean fish out now I have peace who would think these to fish would make such a problem strange so peolple watch your self you just don,t now what you going to get in a fish.

