im not sure wot the usual behavior of the silver are usualy like . the jardini is allways agresive with no chance of mixing ...however i have found that seperation within the tank is often a good start to break the dominant territorial behavior .. by useing a perspex devider with small holes in it to alow flow throuhg of water isolate him and he wont be dominating your tank leave him there for a weak then remove devider.. if he continues being nasty pasty then return him to isolation fo2 weeks ond so on . this process works on MANEY diferent fish that arent usually over agresive .. ps use clear p[erspex .... good luck shane