This is what you want, and what I use. WAY more stable than the crappy common narrow ones, doesn’t rust, and most importantly you can set it front of your tank and move back and forth to access the whole tank without moving the stool, like scaffolding:
View attachment 60776
Oh and the legs fold so you can hang it on the wall in your garage or whatever. I use mine all the time around the house. They’re awesome.
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Sheetrock stilts are adjustable ! Lol
Just need a snorkle for when he falls into the tank and all good than.