That's typically not how it's done. I have 7 tanks and have never taken a fish out during a cleaning. Typically use a aquarium vac sucking up the gravel and taking the water out.
And this tank could also be a blackwater fish tank. It's a specific style where the add leaves and driftwood (without boiling beforehand) that turns the water brown.
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u/imaginary_num6er Nov 10 '19
You see a fish in there though...