The tank we have is 5.5 gal, we use distilled water that we change about 1.5 gal every week. It houses 1 beta, 2 algae eaters, and had 1 ghost shrimp. According to the ammonia indicater we have in the tank says that it has been "safe". When we test the water the pH level is usually at 7 I think. it's typically a blushish color from the tester. We typically keep the tank at 76 degrees with a tank heater. Honestly, I didn't get to see the frog, my boyfriend got rid of it so I didn't have to see him dead but told me he was bloated and red. He was typically a tanish color and was pretty active. He ate frog pellets and beta flakes. This is all the info I can think of...