Hello everyone! I have a 20-gallon long and at the moment for fish, I only have a clown and a yellow clown goby. I am wondering if anyone has recommendations on any other fish I could add. I also want to add another clown so I have a pair, however, I know that clowns are poopy heads so how should I go about that? (I have an Ocellaris and plan on getting another Ocellaris). Also, my filtration is for 50 gallons and I have a protein skimmer.