Hi all so 2 years ago I sold my 75 gallon tank but Im looking to come back! This time it will be a downsize, looking for a AIO tank. Need to keep it on a budget, looking to stay under $500 so Ill be looking for some used equipment. Also have stuff left over from the old set up like my ato setup, jebao wavemakers and a skimmer Ill be selling. Looking for suggestions for aio setups to look out for, looking around 20-40 gallons. Will only house a couple small fish and simple corals.