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I actually connected an airline hose to a long straw. That way I can vacuum the substrate without having to put my hands in much, and I can get to small corners. It's a slow process, but not too bad considering his home's just a 1.5g. And since I don't want to cause too much of a temp fluctuation, I also use an airline to siphon new water in, and I make sure to put the siphon tip near the heater so it can warm as it goes in the tank. Definitely a slow process. But my betta doesn't seem to mind because he hovers around the straw, "sniffing" around all the time. He's gotten used to it.
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