Hello. I recently upgraded my 10-gallon saltwater tank to a 20-gallon tank (may be more than 20-gallons). I haven't checked my parameters recently, as everything seemed to stay stable, but I will right when I get back from vacation. The last time I checked, nitrates and phosphates were both under 10 ppm. Ammonia and nitrites were obviously at 0 ppm. Before making any purchases, I want to make sure it stayed this way. I perform 50% water changes every Sunday and the current stocking is the following: 2x frostbite clownfish, 1x yellow watchman goby, 1x tiger pistol shrimp, 5x hermit crabs, 2x mushroom corals, 1x zoanthid, and 1x kenya tree. Every coral seems to be doing great. They open up during the day and close during the night. I mainly want to get an anemone for my clownfish, but I know it's not completely necessary. What I'd like to know is if it's suitable for my tank, how to take care of it, which parameters I should check, if I need to feed it, etc. All of my corals are on one rock at the moment. There's an empty rock that it could go on. Thank you Any extra information will be appreciated.