Adequate Lighting?

Hello everyone, new here, I also posted this in lighting equipment section, but maybe fits here better?



I have recently taken the plunge into a reef tank after years of success with freshwater systems. I have a small 75L (20 Gallon tank), I was only planning of having it FOWLR (max of 2 clowns), however after getting my water parameters correct I purchased 5Kg (11lb) of live rock I discovered that a piece of the rock has a few red mushroom corals that have opened up.



My tank only has a 11W (TUV?) light that came with the tank, I was wondering whether or not this would be sufficient for the mushroom corals or whether I should upgrade? My upgrade options may be limited as the tank has a hood lid attached that make it difficult to simply add lighting.



Thanks in advance