I bought an aquarium vacuum quite some time ago, but didn’t use it until yesterday. It’s a siphon-type apparatus. You sink the main part, getting it full of water, then turn and bump it up and down a few times to get the siphon action going. (This proved to need two of us yesterday, though I think one person is supposed to be able to do it by themself.)
Once we got it siphoning, it did a good job of sucking up the gravel and separating the debris from it, sucking it out through the tube and into the sink.
I then added the decorations, new filter cartridge, etc, and topped it off with the fish. They’ve been smiling ever since, and the water is nice and clear today.
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