Personally, I'll move those stones on the right to the left and make it in a triangular shape. Also, I'd prefer smaller size for the stones as circled below.
Also, you'd better immerse the water outlet totally. Otherwise, the air bubbles generated will affect the diffusion of CO2. Put aside the CO2 outlet (instead of in the middle of the tank) for better view.
My 2 cents.
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_________________ 24"x12"x14" w/ Eheim 2026+Arctica Mini GLO T5HO 24Wx2 Lighting: 12:00pm-9:00pm CO2: 2+ bubbles/sec ADA Amazonia New
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