I was about to start a water change but noticed my zebra danio were acting unusual. Two of them were stuck in the plants, and the other three were just lying on the gravel. When I opened the lid they went totally mad, darting off at high speed swimming into the glass, plants, and other fish. They settled again for a few minutes on the bottom before starting to swim around. However, whenever I go near the tank they go mad again. At the moment there is just one in a plant, the rest are swimming. My snails, shrimp, and guppy are all ok and acting normal. Whats wrong here?
Ammonia 0.25ppm
Nitrite < 0.02ppm
Ammonia 0.25ppm
Nitrite < 0.02ppm