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I have a 75 gallon community tank that I think is in the very beginning stages of having a fungal problem - only one of my Harlequin Rasboras so far is showing symptoms. I want to go ahead and treat the tank to prevent a further outbreak and take care of the little sick fish, but I'm worried about if the Cories can handle this medication. The active ingredients of the API Fungus Cure are Acriflavine and Victoria Green B. For each 10 gallon packet, there are 3 mg Victoria Green B and 30 mg Acriflavine. If I can not use this in the tank with the Cory Cats, are there any other medications that will treat fungus and columnaris that would be a safer choice for the Cories?

Should be safe, but read the instructions that come with the medication.

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Mats

I should add that fungus is generally not a terribly contagious disease. It is probably better to move the fish to quarantine tank and treat that tank, rather than the big tank - medication should be used as little as possible in aquariums, and it's very likely that the other fish will be fine without medication. Consider if you had ahtletes foot (which is a fungus infection in humans), you wouldn't treat your friends/family in the house if they do not show symptoms of athletes foot, right?

You may also want to check the water quality of your tank - ammonia, nitrite and nitrate levels, pH/KH and GH levels. The vast majority of fish ill health is caused by poor water quality.

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Mats

The instructions do not say anything either way. Nor does the web site, and I can't find anything either way on google either - nothing that says its safe, but also nothing that says it is dangerous for Cory Cats/Armored Catfish.

Water Quality tests:
0 Ammonia
0 Nitrite
10 Nitrate

Well, I just got a 5 gallon that finished a fishless cycle a couple days ago...I was going to put a new Betta in it after I figured out what was going on with the 75 gallon and sorted it out, but I suppose it shall be a treatment tank for now...so I'll put her in there. Being one little Harlequin Rasbora, I don't think it'll be alarmingly small for her if she's only in it a few days. I'll make another topic if the other fish in the 75 gallon start to succumb, thank you for your help.

p.s. I found a Panda Cory fry the same day I found this sick Harlequin. It was 1/4 of the size of my pinky nail, and very adorable.

Thank you for your replies.

Water test sounds OK from those measurements. I'd like to see a pH measurement too.

5 gallon tank sounds like a perfect hospital tank.

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Mats

Sorry to take so long to post the pH test, it is 6.6.