My Zebra tilapia is getting very aggressive. It could be because he is getting to 7+" and it also could be the size of the tank hes in(20 long). Im trying to grow out my oscars so i can put my butti into their tank, without his destroying my oscars. Ive been feeding him cichlid staple. sinking carnivore pellets, Tetra cichlid sticks, and some cichlid gold. Blood worms occasionally as well. Anything else I should add in to help with growth of 1"+ a month?