I have a 20 gallons tank currently with a clown fish, a blenny and 6 lps
corals. I have two questions
1/ do I need a sump? Can I do a 5 gallons sump mainly for a refugium
2/ I'm thinking of adding a blue tang, yellow tang, Atlantic blue tang, flame angel, four chromis, fire shrimp, goby and more corals. Is that too much? What should I not get???
Thank you so much for your time