I have 6 fish in my tank, 4 guppies and 2 balloon mollies. However, since last night, I’ve noticed they’re all swimming around at the surface of the tank. Particularly the guppies. I’ve got no clue why because I have a pump that sprays bubbles so I’m sure there is enough oxygen in there for them. Also my parameters seem ok, my nitrites and nitrates are low. I changed the water yesterday but I added tap safe solution and Tetra safe start bacteria solution because I added a new fish. Also the temperature is 26 C. Is this normal behaviour for these types of fish? Thank you for reading!!