Questions about the Dennerle scaper tanks

Apr 12, 2021
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England UK
I love the seamless simplicity of the Dennerle scaper tanks, and as I am planning on upgrading my betta fish's tank, these do keep catching my eye! I want to create an easy to maintain planted tank for Ethel, with hardy plants and a natural green carpet, with betta-friendly rocks and driftwood. I also want to make the tank a lovely feature in my living room.
Do you think the Dennerle is the best first step? Maybe the 54L one?
And also, are there any other cheaper versions of the square shaped dennerle that you could recommend, or other affordable seamless tanks?
As a total and very twerpy novice at scaping, I will be grateful for any guidance and advice :)