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I presume this is just on the fish's left side? What I see is a darker area of disturbed skin tissue, partially surrounded by a paler area, and then normal skin forward of that.
How long have you had the fish? What other tank mates are there? Although it isn't likely to be water quality-related, what are your most recent measured parameters? Is the puffer breathing normally?
Jay
Wow - that is a very quick decline. I would say it is a systemic bacterial disease, but at this rate of decline, I don't hold out much hope for a workable treatment. One thing to do if it dies - give it a FW dip post-mortem. I always do this on the off-chance that the fish have flukes, and by identifying that, I can be proactive in treating the other fish.
Jay
So good news, went out around 1 to grab some food. Came back around 4 and he is swimming around again. It looks to me more like a wound or a sting
A FW dip is a way to screen for some parasites and to give temporary relief. Basically, you put the fish in a container of freshwater the same temp as the tank with an air stone. I just use tap water as it often has a pH close to seawater.mine has that same weird brown spot. He is acting fine, but that spot is very odd. I hope this doesn’t happen to mine. What is a FW dip? Should I try that?
A FW dip is a way to screen for some parasites and to give temporary relief. Basically, you put the fish in a container of freshwater the same temp as the tank with an air stone. I just use tap water as it often has a pH close to seawater.
If you post a picture of your puffer I might be able to offer other advice.
Jay
If you don’t have any anemones or stinging corals in the tank, I would think this is likely a bacterial infection. Often, these heal on their own, but given how fast this developed, I’m worried it will continue to spread. Antibiotics really shouldn’t be dosed in your main tank, so that would mean using a treatment tank. Dosing with a broad spectrum, gram negative antibiotic would be the treatment.Thank you for your help. I’m not familiar with how to work this forum, yet, so sorry if I’m doing something wrong. When we brought him home from the local and trusted fish store yesterday, he did seem to have a funny bump on that side but it wasn’t discolored and didn’t look like anything more than something under his skin or maybe a part of his muscle? I don’t know….this morning it is a big brown patch. He’s eating like a champ and he looks fine swimming around and hanging with his pal, the trigger.
You will have much less heartache and save much more money if you learn and master the art of medicated quarantine before introducing any new livestock to your display tank.This saltwater thing is heart wrenching. I’ve lost thousands trying this….but it isn’t the money. It is my heart seeing things suffer.