sudden disease ?

buzzer

Member
I have a 12 year old 65 gallon soft coral reef tank and most of my fish are of a decent age.
My newest addition was 4 months ago being a lubbocks fairy wrasse.
A few of my fish have started to display symptoms that I am unsure of what they are.
Lemonpeel Angel , started to lose colour over a week then died but behaved normally , this fish was 12 years old so put it down to perhaps end of his life cycle.

Since that death
Both Clownfish (10 years), have discoloured eyes but no further sysmptoms.
Regal Damsel ( 5 years), has small white spots over fins and body ,swimming ok
Royal Gramma ( 2 years), hard to see spots , looks more like a velvet appearance , scratching a lot.
2 x green chromis (12 years) both look fine
Lubbocks fairy wrasse (newest addition at 4 months) looks fine

The only thing I can think of what might have caused this is that during a water change 2 weeks ago I removed some (a third)of the display tanks gravel and replaced it , the gravel is only about an inch thick and is only for aesthetic use.
The tank is filtered by a deep sand bed in the refugium and live lock in the display tank.

Could the stirring up of the gravel have caused an outbreak of a dormant disease and if so what are your thoughts.
I have been lucky in the 12 years I have had the tank , I have never had an outbreak of white spot or velvet disease but I am thinking my luck may have ran out.
Please advise.
 
white spots could be ich, cloudy eyes usually a bacterial infection.,
stirring things up with that substrate may have degraded you're water enough to cause some issues.
 
yes , it is looking like velvet now as I have lost a clownfish and the regal damsel within days , the 2 chromis and the lubbocks look absolutely fine , could these be immune ?
 
remove the gravel and have a velvet outbreak.. damn strange.
so it was either laying dormant for some period over the 12 years the tank has been going or came in on the last edition 4 months ago and layed dormant for that long before releasing. not sure.
 
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