Whatever you do DO NOT put ghost shrimp with guppies cause they will kill your guppies. I never had a problem with guppies dying or anything until I put ghost shrimp in with them and then my female guppies started dying. I went and spent alot of money on test and everything until I realized that it was my ghost shrimp killing them and I seen that for my own eyes. And then I took the shrimp out of my guppy tank and I even seen the shrimp attacking my angelfish also so I had to get them ones out of that tank also... So whatever you do DO NOT put the shrimp with and of your fish they will kill them.....