i would say 2 of these model 75 http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=16729
and then maybe an fx5 but that might be too much
if not an fx5 then a fluval 405 canister and you would be set to go
btw the aro will outgrow ur 125 pretty quick
and then maybe an fx5 but that might be too much
if not an fx5 then a fluval 405 canister and you would be set to go
btw the aro will outgrow ur 125 pretty quick