well i have no experience with brochis multiradiatus or hoplo catfish but i have experience with goldies.
Firstly are the common/comet/shubnkin goldies or fancy goldish??
Some photos of fish and tanks would help, how many goldfish do you have, if you have comets i wouldnt suggested anymore then 2 although really there should only be 1 comet in 75 gal. If you have fancy goldies you could have maybe 2-3 but that would be very fully stocked. I dont reccommend adding any more fish unless you get a larger tank or rehome some goldfish.