have a 20 qt with a filter ment for a a tank up to a 75g and a hygers wave make I ran on a 55 gallon last year. I had not done a water change since I set it up no fish and got the fish on saturday and a long with some hermit crabs for a little bit of waste Woke uop today and dead Domino damselfish baby ate mysis I had lying around from February still good
