I have a saltwater tank ready for fish, I'm not sure how many gallons it is due to it being my first Hexagon shaped tank. It was gifted to me a long time ago, but I'm guessing its between 20 to 30 gallons. My plan is to put a pair of clownfish in it and since I believe it's to small for an anemone, I'd like to put maybe another fish or maybe something else depending on what yall think. It's not my first rodeo with saltwater aquariums, but it is with this shape of tank. I would love to get another puffer or long nose hawk fish, but I'm pretty sure a hawkfish wouldnt be happy in a round ish tank of this size. Any ideas of tank mates that would be happy in an aquarium like this with two clowns?