yes all three are in the same tank and all levels are,well i wanna say perfect,but after a feeding(every three days)the nitrites arent exactly baby blue but never reach .25 either im currantly planning an addition to my home which will house my indoor pool and a pond that would be 20 feet by 7 feet by about 3 and a half feet deep the water temp i try to keep at 68 to 69 degrees,as far as feeding,mostly smelt but sometimes silversides or squid,as a treat some krill but the port jackson is not too fond of it,every one of my girls is happy or so it seems,they love attention and to be held and pet.seems strange but ive had them so long their used to it