OK, those are all soft water fish, so that's good with your water parameters. Panda corys are for some reason quite delicate, many lose several like this. This species is no longer wild caught but commercially raised, which one would think would increase its hardiness but it has not. They also need cooller water than rams so watch this.i have about 16 rummy nose tetras, two german blue rams, and 3 panda cories (these are new additions..ive bought 7, and only 3 have managed to make it...)