ok i took down my 150 and set a 220 in its place, i had a mature sailfin tang that was in the 150. i removed it so i can open up the tank for other tangs. i bought a juvi saifin and it is in the 220. (also a med naso and a small hippo) my girlfriend and daughter really like the mature sailfin, can i later on down the road put the mature sailfin in the 220 with a juvi sailfin?, is it a big risk or it can be done? ty