I just bought 2 new swordtails and I'm having a problem with them. One has jumped out (blind spot on the cover) and died while I was out. The other is continuously jumping out of the water. It recently (somehow) jumped and ended up in the filter box where the water was. Is there a way for me to prevent this? Is it because of the water or just adjusting to the new environment? Should I buy a test kit for the water levels and stuff to find out? Thank you for any help/suggestions.