Could an arowana and a pack of 6 clown loaches live in a 125 to grow them out im getting the arowana at about 4 inches and i was wondering how big i should get the clown loaches
depends on the aros personality.. get a small aro and the biggest clown loaches you can find/afford.. if the aro is say 5" and the clowns are to you won't have to worry.. what you need to worry about is the aro outgrowing the 125..
Your small aro may be stressed by all the frantic movement from the loaches.
Once your aro is bigger, there will always be a chance that your aro could eat the loaches. Give the loaches ample hiding spots and keep the aro well fed and they'll be fine.
Clown Loach are very active fishes. I had to sell my 10 Clown Loach (4-5") becasue my Black Arowana (12") was very nervous. But they live together more than 3 months without any fights and problems.
they are fine together, just get loaches @3" and up and do not let your aro go hungry and never feed your aro feeder fish or any live food then they are fine.