It's a 10 gallon tank with 3 adult male guppies in it. The guppies, the filter, a little less than half of the gravel, the Cryptocoryne Wendtii, the heater, the seaweed clip, and two decorations that are all in the 10 gallon were in the previous tank, a 5.5 gallon. There's a big new decoration in there and a new thermometer, too. The fish are swimming a little more slowly. The most recent API Freshwater Master Test Kit results: 7/1/17 Nitrate 5 ppm Nitrite 0 ppm Ammonia about 0 ppm High range pH 7.9-8.0 7/10/17 Nitrate 0 ppm Nitrite 0 ppm Ammonia 0 ppm High range pH less than 7.4? pH 7.6 Am I going to have to go through a cycle again? And should I add more crushed coral to the filter for the pH? I put two tablespoons of crushed coral in there a few weeks ago. I think it's time to replace some of the coral anyway. Is that right? If so, how much of the original crushed coral should I replace?