We have a 5ft marine fish tank that we inherited when we moved into our house 2 months ago. We are super new to fish and marine life and need help.
About 4 weeks ago we saw white puss coming from one of the corals and the person at the fish shop said not to worry as it was spawning. Still then they have all started to die, green ones turn purple, leaves turn white and die. It looks awful.
The guy in the fish shop said it could be the water hardness but we are adding chemicals and that is not helping. Please please can anyone help.