Jardini will kill cl's even if they can't eat them due to the pectoral spikes (this will deter most predators) the problem is with jardini they don't give up easy and the relentless chase causes stress cl's dont do well under stress , if you introduce a large group when the jar is young it'll give you the best chance of housing them ( saftey in numbers ) but in the end it all boils down to your jardini's attitude if you get a killer then chances are you'll lose tankmates