I did a big job today that have been planning on for a long time. I changed out half the substrate in my large aquarium. Tired of noticing the gravel bed, want it to be more uniform size, smaller grains, darker color overall. Glad I did it but it sure was a lot of work. I tested my equipment the day before- a few small airstones, extra air pumps that I don't use all the time because they're too noisy. Got a few new clean five-gallon buckets also.