Currently I havea 10 gal with 2 guppies and 5 ghost shrimp. Amm 0, Nitrite 0, Nitrate 10, pH 7.6. On Wednesday I added 2 more guppies to the tank (there was a bonus fry in the bag!). On Friday one of the new guppies was dead, I lost the second one this morning. But that silly fry is still alive and racing around through the tank. I have no idea what could be going on but these two guppies that are in there have been through cycling and an ich treatment and seem to be superfish. What could be going on that I am not detecting?