thanks bro ari for the knowledge sharing...
my friend (also frontosa keeper) ask me to let go all the mblues and trade in for more zaires to free up some tank space.. they are my fish batch of frontosa, eventhough they are all F1 with the common white spot defect on their stripes but i hv keep them close to 1 and a half year, some grew from little to big size of now, got some feeling with them

once u r into frontosa, u cant resist the temptation of zaire, and so do i, that is why i added 3 F0 and 2 F1 kapampa later and never thought of the tank space problem:P