My power has been out for the past 8 days. I have a 29 gallon w/ a HOB filter and a canister filter. I have 5 corys, an angelfish, fem betta, 6 tetras (very small, like neons but they are gold, 3 more little tetras (like small H. rasborasw, with some blue again they are tiny) an albino bristlenose pleco and a CAE. I assume the bacteria (cycle) is dead. What do I need to do to at least make it liveable for my fish? Should I do a 100 percent water change? Take the gravel out and clean it? Leave it be?