I can’t tell you that my friend. Like others said, you might have a low oxygen issue or an ammonia issue. Oxygen is easy to correct. Get the flow going and the top of the water rippling good. Test for ammonia. If higher than 0.1, get to the LFS first thing in the morning and get some ammonia binder (ammo lock or Prime) and do a good water change. Continue with high flow as this will keep your pH up and help keep the ammonia in a less toxic ionic state.Do you think anything will die?