The reason for saying that is young pbass are fragile and contract ich rather easily...which for young pbass can be fatal. Once they are past the 5" mark they get pretty tuff. One key is keeping youngins at a temp of 82-84*F and I have even kept them around a steady 86*-remember that in the wild youngin pbass stay to the shallows which in south american waters is quite warm in temperature. If you nip the ich issues and keep them unstressed and well fed you should have no problems with them....but alot of people have problems and give up on them altogether before they can really experience cichla in full force....once you keep them and witness the lightning fast water blowing eating machines....you'll never turn back
Keep the temp up and keep em growing fast untill they are putting good size on and you'll be fine........good luck and let me know how it goes....cant get enough pbass pics ya know
this is good info 
