he will grow pretty slow in a ten. I bought 15 rotkiels off of aquabid in august and gave some of the extras to people I know. I have some in my 150 and they are 3-4 times the size of one of the guy who keeps them in his 20 and they are a 3rd bigger than the ones I keep in my 44. He is definetly to small for the arowanas but when he is bigger he should be alright
