I cannot say you cannot or can put leichardti with silver. i have seen people with 3 silver and 2 jardinis in a 180 gal tank with no problem. I am basing the jardini since this is the closest relative of the Leichardti. I have a fellow friend in the hobby that has a leichardti from what he has told me it has an attitude towards fish that tries to occupy the top portion of the tank.