I have a 20 Long saltwater tank with star polyps and button polyps. I had a 55, but my freshwater fish from my 29 out grew the tank so I had to scale down my 55 saltwater to the 20 L to make room which I regret doing. My lighting is 2 t-5 bulbs that are strong enough for stony coral. Right now for inverts besides my 2 typs of polyps are hermit crabs. Would I be able to do 3-4 neon gobies and maby a common clownfish? I'm going to get captive bred neon gobies online cause in my area, the fish stores only stock wild fish, even the ones that have been bred for years.