I attempted my first saltwater aquarium a little under a year ago, and it did not go very well for reasons likely related to old equipment. It was 55 gallons, and this time I would like to try something a bit smaller. I have successfully owned a freshwater aquarium for 3 ish years now. I consider myself to be quite educated, but I am looking for some fresh ideas or apporaches, spesifically in tank sizes. I am not looking to spend any more than 800 dollars on it, not including fish. Anything helps!