Please help-black spot on tang tailfin

[Doglips56]

@ReefSquad
Here is a video of my tang. He’s happy, healthy, active, eating and in no distress. We had an ammonia spike about 10 days ago that almost took he and the clowns out but they survived but he’s had this black spot since. Got better but back now?

 

[vetteguy53081]

@ReefSquad
Here is a video of my tang. He’s happy, healthy, active, eating and in no distress. We had an ammonia spike about 10 days ago that almost took he and the clowns out but they survived but he’s had this black spot since. Got better but back now?

May be a paravortex flatworm but can also fin ray damage.
best way to determine is to give it a dip either with freshwater the same temperature as your display tank or with use of prazi pro which is praziquantel assuming it’s a flatworm

 

[Doglips56]

Thank you @vetteguy53081 , you are always so kind and helpful. I have Pratzi. Freshwater dips scare me but I’m willing to try it. I do have a cycled QT tank set up

 

[MnFish1]

I disagree. I would wait - to see what happens to the spot. Or just treat with Prazipro. Without answering the questions recommended at the top of the forum - its impossible to say - and in fact - it is probably not an emergency

 

[Doglips56]

I disagree. I would wait - to see what happens to the spot. Or just treat with Prazipro. Without answering the questions recommended at the top of the forum - its impossible to say - and in fact - it is probably not an emergency

I didn’t say it was an emergency I just don’t want to ignore a potential issue in a fish I adore

 

[MnFish1]

I didn’t say it was an emergency I just don’t want to ignore a potential issue in a fish I adore

I apologize - that came across in the wrong way. in writing. To YOU it is an emergency - because it's your fish - and I understand you want to know the answer. I was trying to say - to the fish - it's probably not if it is acting normally. I apologize if I came across as something different

 

[MnFish1]

But - I would also suggest you answer the question at the top of the forum.

 

[Jay Hemdal Verified Community Expert]

@ReefSquad
Here is a video of my tang. He’s happy, healthy, active, eating and in no distress. We had an ammonia spike about 10 days ago that almost took he and the clowns out but they survived but he’s had this black spot since. Got better but back now?

I would say this is just fin ray damage. To large to be any of the common communicable diseases. As injuries heal, fish often deposit granulomatous tissue that can look dark.

The ammonia spike is worrisome though - established tanks with corals, etc. rarely if every spike. Your tank doesn't look newly set up. Do you know what happened?

Jay

 

[Doglips56]

I would say this is just fin ray damage. To large to be any of the common communicable diseases. As injuries heal, fish often deposit granulomatous tissue that can look dark.

The ammonia spike is worrisome though - established tanks with corals, etc. rarely if every spike. Your tank doesn't look newly set up. Do you know what happened?

Jay

I do. We treated the tank with FluxRX for a GHA outbreak that we had been dealing with for about 9 months. We’re really able to get nutrients under control but no amount of that or manual removal was working so LFS suggested treatment. I added two air stones and followed directions to a tee but on day 12 I had gotten sick and went to ER and when we got home everything was almost dead. Most of my snails were dead, fire shrimp was floating but we were able to save him, I only have 2 clowns and the tang for fish and they were in severe distress, RBTA’s looked terrible. Thankfully we are getting ready to upgrade to a larger tank so I had a bin that is cycled curing rocks and was quickly able to move my corals to it and had a QT tank cycled and ready and was able to move the fish in there. Wasn’t able to move the RBTA’s because their rock is huge but did massive water changes, added carbon, 2 bottles of live bacteria, NeoNitro and a bit of NeoPhos because it was wiped out….undetectable nutrients. I’m just guessing on the ammonia spike, didn’t test for it but it was suggested. All is doing well now but got a massive brown algae/diatom spike. Just added a whole new crew of snails from reef cleaners. My tests today revealed zero detectable nitrates again which is a little worrisome. I did add move live bacteria (the refrigerated kind) and some NeoNitro but other than the black spots on his tail he acts totally normal. Clowns are great, corals all open and looking happy, RBTA’s not what they used to be but seem to be recovering.
Temp - 77.8, controlled and stable
dKH- 8.4
pH - 7.8
PO4 - 0.08 (up slightly)
NO3 - not detected
Tested with Hanna checkers, NO3 is with high range checker, I don’t have the low range one

 

[Jay Hemdal Verified Community Expert]

I do. We treated the tank with FluxRX for a GHA outbreak that we had been dealing with for about 9 months. We’re really able to get nutrients under control but no amount of that or manual removal was working so LFS suggested treatment. I added two air stones and followed directions to a tee but on day 12 I had gotten sick and went to ER and when we got home everything was almost dead. Most of my snails were dead, fire shrimp was floating but we were able to save him, I only have 2 clowns and the tang for fish and they were in severe distress, RBTA’s looked terrible. Thankfully we are getting ready to upgrade to a larger tank so I had a bin that is cycled curing rocks and was quickly able to move my corals to it and had a QT tank cycled and ready and was able to move the fish in there. Wasn’t able to move the RBTA’s because their rock is huge but did massive water changes, added carbon, 2 bottles of live bacteria, NeoNitro and a bit of NeoPhos because it was wiped out….undetectable nutrients. I’m just guessing on the ammonia spike, didn’t test for it but it was suggested. All is doing well now but got a massive brown algae/diatom spike. Just added a whole new crew of snails from reef cleaners. My tests today revealed zero detectable nitrates again which is a little worrisome. I did add move live bacteria (the refrigerated kind) and some NeoNitro but other than the black spots on his tail he acts totally normal. Clowns are great, corals all open and looking happy, RBTA’s not what they used to be but seem to be recovering.
Temp - 77.8, controlled and stable
dKH- 8.4
pH - 7.8
PO4 - 0.08 (up slightly)
NO3 - not detected
Tested with Hanna checkers, NO3 is with high range checker, I don’t have the low range one

Wow - that sure sounds like an ordeal all the way around, hope you are feeling better!

Jay

 

[Doglips56]

Wow - that sure sounds like an ordeal all the way around, hope you are feeling better!

Jay

Well I have COVID and just spent more time hospitalized but I’m slowly getting better, thanks! So don’t worry about the spot on his tail as long as he’s fat and happy?

 

[Doglips56]

@Jay Hemdal please see pics for a new and disturbing development on my tang.
I’m getting the hospital tank ready, pH is much lower than DT so trying to correct. Initial copper dose in tank, will move him in AM if you think it’s ok to wait. Otherwise fully cycled and ready to go

 

[Doglips56]

@ReefSquad