I have 2 saw shelled turtles which are about 10-12cm shell length and a barcoo grunter about 15cm. The barcoo is getting too big for his little 2ft tank so want to move him into the larger turtle tank. Would there be any problems? The barcoo would get to the food before the turts but i can hand feed the turts to overcome that prob. Would it be worth giving a go? I can always put the fish back if it doesnt work out.