no. not even softies. 17watt for a 20g your doing 0.85 watts per gallon. if you wanna keep hammer, frogspawn, and candy corals you need to do atleast 2.50watts per gallon or more. and and dont get 50/50 lights. get 1 daylight 10k and 1 actinic blue and your ready for corals. i believe 50/50 suck really bad.