Help, lost 3 fish in 3 days

[Gregorjw]

I'm hoping someone can help me figure out what's going on my tank. I've lost 2 anthias and a tang since thursday/Friday.

I have a 75 gallon reefer 350, it's about a year old now. I believe my parameters are good..
Salinity 1.025
Ph8.2
Temp 77°f
Nitrates 15-20
Phosphates .3
Ammonia 0
I cant find nitrite test reagents at the moment, but I'd assume they are the issue.

My stocklist is...
2 banghai cardinals
1 mystery wrasse
1 flasher wrasse
1 Frostbite clownfish
1 purple firefish
1 gold Midas blenny
1 carberryi anthias
Several hermits
Several snails
Cleaner shrimp
Fire shrimp
2 emerald crabs
3 cranberryi anthias (deceased)
1 yellow eye like tang (deceased)


To start about 2 weeks ago I lost the first anthias, he was never very active hiding most of his time and only coming out to feed, I assumed this was from bullying in the qt but when he went in the display he pretty much disappeared until I found his cleaned skeleton.
The second anthias I found dead friday morning, i did a freshwater dip but didn't see anything, previous to this he had been acting normal.
Third anthias passes sometime last night, before I went to bed I noticed him swimming odd, no spots or anything visible on his body. This morning I found his skeleton sticking out of a rock flower anemone.
This morning I also noticed the yellow eye like tang in an odd spot of the rocks, it was still early before the lights came on and he was breathing normally and swam about a little so I wasn't terribly concerned. I come home from work and he's dead and covered in hermits.
I've attached a photo, I think the orange discoloration is from where the hermits were eating him, it took a while to peel them all of of him. Also I know he had HLLE, which he developed in qt but he definetly seemed be recovering since he made it into the display. The tang had been in the tank for 4 months or so and the anthias maybe 1 month, they all spent around 8 weeks in qt.

Also I did treat with prazipro on Wednesday, a couple of the fish unfortunately didn't get a full round in qt, and my blenny started flashing so I decided to treat. They only went with one round, and I was very careful not to overdose and I made sure to increase airflow on account of the wrasse.

Thanks everyone for your help, I really want to get this figured out before anyone else passes

 

[HotRocks]

Any spots on any of the sick fish, are they displaying any other symptoms. Flashing scratching swimming into powerhead?

 

[Gregorjw]

I haven't noticed any spots, the only symptom I've ever noticed was the blenny who had been flashing, that's the reason I started the prazipro. The anthias did seem to hide a little bit more before the died, I had assumed it was an aggression thing though

 

[Gregorjw]

Now that I think about it I did notice a couple of spots on the tang several weeks ago, I got nervous so I sent a pic to my friend. But just a couple hours later the spots were gone so I assumed it was just sand or something and I had overreacted

 

[JaimeAdams]

It should be noted that all coral, fish, inverts were QT and Treated with copper or CP, multiple Prazi treatments externally, general cure/focus in food.

 

[HotRocks]

It should be noted that all coral, fish, inverts were QT and Treated with copper or CP, multiple Prazi treatments externally, general cure/focus in food.

Is this someone you know Jaime? Could it possibly have been cross contamination or a prazi resistant strain of flukes?

 

[drstardust]

It should be noted that all coral, fish, inverts were QT and Treated with copper or CP, multiple Prazi treatments externally, general cure/focus in food.

Hmm...that makes it frustrating. If done correctly, such a regimen should address most pathogenic things. Unless you had prazi resistant flukes. Was anything wet added in the meantime? Do you QT inverts, for how long? Are you diligent about not cross contaminating between QT and DT?

 

[Gregorjw]

Hmm...that makes it frustrating. If done correctly, such a regimen should address most pathogenic things. Unless you had prazi resistant flukes. Was anything wet added in the meantime? Do you QT inverts, for how long? Are you diligent about not cross contaminating between QT and DT?

I like to think I've been pretty diligent on quarantining anything wet. The tang and firefish were added after an abbreviated prazi schedule though, the reason being the HLLE that the tang developed in qt. They both went through a full 30 days of cp, but I pulled them after just 2 rounds of prazi. I believed the stress was causing the tangs HLLE and hoped he'd do better in a larger mature tank, and up until yesterday I thought I was correct

 

[Gregorjw]

Hmm...that makes it frustrating. If done correctly, such a regimen should address most pathogenic things. Unless you had prazi resistant flukes. Was anything wet added in the meantime? Do you QT inverts, for how long? Are you diligent about not cross contaminating between QT and DT?

I qt all my corals for at least 76 days, same for inverts, shrimp got moved in after molts though. And the rock flowers didnt spend 76 days in qt, my reason being they dont have any stony structure for cysts to attach to. I can't say I was 100% diligent on the cross contamination, but I do keep seperate syphons, buckets, pumps...etc for each tank.

 

[Gregorjw]

So far today, all the remaining fish are alive and still symptom free. The last anthias does seem to be hanging out by the cleaner shrimp though.
Also after thinking about I did add some inverts which weren't quarantined by myself, but the site I ordered from said they came from fishless systems