You still need to read more and more!
A 5L Co2 with a JBJ solanoid is around 100+120= 220. Otherwise a manual regulator is around 30. For manual, to avoid the trouble of tuning every day, I leave it open 24/7.
I used external cannister filter. Jebo ones around $60-70, Eheim 2026 around $200.
Ya 55w is alright. Should allow you to have a glosso lawn.
Snails population can be controlled by the amount of food you feed to your fishes.
You might also consider a fan to keep the water cooler.
Go and read more on fertilizers (the macros and the micros).
Cheers, Christophe
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