mandarin goby white spot

[J3C2]

mandarin goby has a white patch at base of fins. not ich, fins all intact, eating well, has been this way about a month. now white and black damsel is pecking at it. no other fish affected. please help/advice.

 

[Betta132]

Pics?
Tank size?
Tank age?
Tankmates?
Exact water parameters?
That's a mandarin dragonet, by the way, they aren't gobies.

 

[J3C2]

thank you, 90 gal. 5yrs old , black and white stripped damsel , blue hippo, yellow tang , clown fish , an orange flame fish, purple goby. cleaner shrimps. it's my husband's tank, he says all the water parameters are good. I'm trying to help because he is blaming the black and white damsel and I made him keep it. they have been together in the tank about a year without any problems. i can't figure out how to post a picture

 

[snorvich]

Most likely sand (their slime coat can be sticky) or lymphocystis.

 

[J3C2]

not sand, what is lymphocystis?

 

[lonbrat]

Yeah, I'd guess sand as well..I have an ich outbreak in my tank and every time I see my mandarin with white spots im almost certain it's sand. It falls off easily when the fish swims, and it sticks only sometimes from what I noticed.

Just see if he's scratching.. That would be a sign of it not being sand
I hope the best for you! ^^

 

[J3C2]

info

info

90 gal , 5 yrs old, other fish: blue hippo, yellow tang, orange flame, clown fish, black and white striped damsel, purple goby. parameters all good. cant figure out how to upload a pic. it is a large flat white spot at the base of his lateral fins. , not ich or sand.

 

[Betta132]

Your blue hippo needs more space, I'd suggest you remove it before it gets aggressive.
Could it be a burn or a bite mark? Maybe some sort of fungus?
Upload the pic to Photobucket and post a link.

 

[J3C2]

picture

picture