Thanks,could be tetras,water checked out fine, as they have only been in the tank since Sunday they just didnt quite like their new envirament so now I have 4x penquin tetras in with the angels which Ive now removed,given the tank a 20% water change,set temp at 30 and added tonic salt 2 tbsp to 55 lit,the very large angel is brighter now and swimming around whereas the other two are just quietly in the corner still near top of tank and not feeding,their veiltails are still red and shedded,fungus is down to half of what they were this morning ,keeping a good close watch on them