Only two recommendations I have...
On the scape you need to create some dynamics in the substrate such as sloped up in one corner to the front. A little character there can make a huge impact, learned that myself after several tries lol.
On the co2 don't skimp, now you don't need to go by Ada equipment and really drop money. But get good solid equipment to start with and its a good chance it will out live your hobby. Also less headaches and I highly recommend a 2 stage regulator
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Sump Pimp #8
RAOK Clubber #28