Thats what im thinking , i have a 5 gallon quarantine tank , could i put the 3 ottos in here and the 3 dwarf puffers in the other 5 gallon.I currently dont have alot of money to upgrade but will if necassery.
Just watch the water quality. Feed the puffers live worms to reduce pollutents. Feed the ottos sliced zuchinni or cucumber again to reduce waste. Do at least weekly 50% water changes and you should be good. Though make sure the otos can hide from the puffers. Remember dwarf puffers are moderately aggressive and depending on exact species might kill each other off.