220g reef with aquamadic sump system 2x250 MH lamps and actinic tube. Water parameters T.80,Ph8.0,Phos0,Nitrate3,Sg1025,Alk9,Calc280,(due to poorly adjusted CO2 reactor).Tank is dominated by coraline algae, thriving Xenia, mushrooms doing ok. Recently introduced candycane, plate coral and hammer. The hammer has developed a jelly like dissolving fungus which has now eaten10% of polyps in one area. Can this sort of infection be treated?What is likely cause? Comments welcome.