I have a quick question, I have a 29gal tank with one 2inch pleco, I was wondering if I can add a 4in aro in their??? i have a 75 gal but if I put the aro in their my gar would eat it... So I was wondering will the aro be fine in a 29 gal until it gets bigger??? Oh and my last question is, are arowanas considered fast growing fish?