Please help I'm losing the will to carry on !!

Afternoon to all, hope I'm in the right place, I have a 1 and bit year

Reef tank with 3 fish and a handful of small frags that I have purchased over some time now.

Just before Xmas my sea hare died and "spiked" the tank even after serveral water changes and limiting the light I still have a major issue with brown algae.



Can some one please tell me where I'm going wrong



Thanks

Jamie