ok so my figure 8 puffer suddenly stopped eating, i tested my water, and nitrates, less than 10, nitrites and ammonia are 0, ph is 7.8, salinity is 1.008, and temp is around 78, the only recent events i can think of that would do something is my heater malfunctioned, and i left for 4 days. ive tried everything, live food, frozen, garlic extracts. any tips would be helpful