i have a pair of jaguar cats in my 65 gallon with 3 zebra danio, 3 leopard danio. 1 gold severum(soon to be rehomed) and 2 green severums. also 1 BN pleco. so far i have not noticed any aggression, although i started out with 8 danios and now have 6. i can only assume it was the catfish as i havent noticed my severums even acknowledging the fact that the danios exist. but for the most part, in my experience, the catfish are very interesting and somewhat peaceful(still aggressive but not overly so). i wouldnt put them in a tank smaller than 55-65 gallons though as they get pretty big and fat. mine tripled in size within 2 months.
Finally reached 6 tanks... oh god, this addiction is getting serious. 75g mbuna tank, 65g gold severum, 55g OB peacock breeding colony, 30g(36x18) growout, 20 long Dwarf Alto's, 10g fry tank.
If I die young bury me in... An 8x2x2 with versa tops and a large sump for adequate filtration;)