Nothing can really live with a gulper catfish unless it is significantly bigger than it. https://www.monsterfishkeepers.com/...-to-get-a-gulper-catfish.730163/#post-8236726Gulper catfish sounds good what also could live with it also can someone answer the previous 2 questions please
As for your previous two questions
1. A school of barbs, tetras, or similar fish would be a good community option. Could also go for some peacock or mbuna cichlids potentially.
2. I'm not too familiar with BGK, but I honestly think an 80 gallon might be a bit small for them as they can hit well over 16 inches. I'm not really sure if tankmates could go with a BGK in such a small tank, either. Others would probably have much better input than me, that's just what I think.