Fast Breathing-Hiding-No Visible Signs

[jbhumphreys]

A few days ago one of my fish, Coral Beauty, started breathing fast and hiding in a corner, the next day it was dead. Now my other 2 fish are also breathing Fast and not actling right. They both eat when food is placed in the tank. Fish are a Percula Clown and Hipo Tang. After doing some reading it sounds like this might be a parasite in the gills. There is no other sign of illness on the fish other than them breating very fast. I have done two 15% water changes over the past 4 days but this has not helps. Had my water tested and all readings are fine.
Does this sound like Gill parasites? If so is there any medicine I can put into the tank to cure this without hurting my snals and crabs?
Thanks,
Brian
55GL, Fish, 50lb Live Rock, Snails and Hermit Crabs , 4inch sand.

 

[beth]

Can you provide some additional info. Like have you added new fish without QTing? Other symptoms, notice any spots, etc.
Take a look at the Thread which details how to post in the Disease Forum. All the info you can provide helps us get to the bottom of your problem.

 

[jbhumphreys]

No new fish added. Added about 20 scarlet hermit crabs and some snails about 2-3 weeks ago. No visable sign of illness, spots, etc. Only very fast breathing and hiding.

 

[beth]

What are your water readings? Include pH and temp as well as the other readings.

 

[jbhumphreys]

PH 8.2
Salinity 1.023
Alkalinity was a little low at 9 but did water change and added some plus. Have not had tested since.
Magnesium was good
Amonia 0
Nitrates 0
Nitrites 0
Temp 78