I've had my 20g long tank set up for about 2 months, i have coralife lighting, live rock, live sand, a water pump to keep the water circulating, 2 serpent star fish, 1 Mexican turbo snail, 1 peppermint shrimp, 1 pink anemone, a few polyps green with orange and some with purple and 2 urchins. I did have a tang unfortunately it did because of black ich so whould i wait till i get another fish? or what should i do next? any one have good advice?