About three hours ago I had bought another live plant for my tank a water fern from my lfs. I then cleaned and installed it in my tank. I left for a few hours came back noticing one of my guppys swimming all crazy doing flips and spins all over the place. I then changed 25% of the water. And now its laying in my fake grass i have nose first. Hoping that it doesnt. Die I dont have a master test kit. I have a ph tester that is curently reading 7.8 and thats the highest it goes. I dont know what to do?