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Here's why: the beneficial bacteria you're trying to grow (Nitrosomonas and Nitrospira) need three things—oxygen, surface area, and a food source (ammonia). Sitting in a bucket of old tank water gives them surface area and maybe a little ammonia, but no water flow means no oxygen. The bacteria...

Great thread—and the range of answers here really shows there's no single "right" schedule. The consensus seems to be: clean when flow slows, not on a fixed calendar. A few things that stood out to me: Pre-filter sponges are the real MVP. Several of you mentioned intake sponge covers (Fishfur...