IMO, Two AC 110's are more than enough filtration for your 125 coupled with a 50% WC each week. A sump would be an added bonus, but not really neccessary. Since all your fish are still small, I'd put them all in the 125, minus the Convicts. I'd rehome the Cons and replace with a grouping of Firemouths. I'm not a big fan of Convicts.
You might be surprised how long they can coexist. Not every Oscar grows to a foot long and sometimes RIvulatus aren't as aggressive as advertised. Good luck with your new setup.
You might be surprised how long they can coexist. Not every Oscar grows to a foot long and sometimes RIvulatus aren't as aggressive as advertised. Good luck with your new setup.
