12-19-2009, 11:39 PM
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OK. So after reading through the diseases sticky, and spending hours and HOURS online here and other places, I've come to the conclusion that our little Cory likely has a mycobacterial infection (Piscine TB).
We have a 6-gallon Marineland setup with biowheel and cartridge filter. Probably at the upper limit of what should be living in it.
4 Harlequin Rasoboras (approx 1-1/2")
1 Otocinclus (approx 1-1/4")
2 African Dwarf Aquatic Frogs (one male and one female)
1 Emerald Corydoras (now quarantined in a 1.5 gal hospital tank)
We are fairly fastidious about water changes. 25% once a week with a gravel vacuum. The aquarium is heavily planted to help keep the oxygen levels up, and the nutrients under control.
Temp is fairly steady around 78 deg F. Nitrates always read in the "safe" zone with our test strips. Nitrates, chlorine, and ammonia are always too low to register. We keep the pH a little on the high side for the frogs. 7.2-7.4.
Anyways - back to the TB. We had the frogs previous to getting the aquarium. They were a gift from a well-meaning relative. After about a week it was obvious the tank they came in was just not adequate for them, so we bought a nice 6 gal Marineland setup. We bought some live substrate and planted it. We let the tank sit for a week, and watched the chemistry to make sure it was stable before adding the frogs. Decided to add 4 Harlequins to the two frogs for some eye candy. The frogs are not always active/visible.
One of the 4 Harlequins died about 3 days after coming home with us. No warning. Went to bed - he was fine - woke up and he was stuck to the filter intake. Took it back to the pet store with a sample of our water. The store attendant said the nitrites maybe looked a little high. Took our replacement fish home, and tested the water before introducing him. It looked fine (nitrites did not register).
Everything was fine for a month. Started having some algae buildup and were worried about it building up on the leaves of the live plants, and so brought an Otocinclus and a Spotted Cory home. That Cory got very ill the next day. He seemed weak, was having equilibrium problems, and the area around his mouth turned red. We took him back to the store before he passed (with a sample of water). The attendant checked the water, and everything was great. She said the Cory maybe had some kind of parasite that caused it to hemmorhage internally. Seemed plausible enough. They said they would stop selling fish from that tank temporarily and tag it for observation. Accepted the Emerald Cory as a replacement from another tank.
Two months with no issues until the Cory started to develop a growth identical to the one in the picture put up by the original poster.
I know the disease sticky thread states that treating is not practical for fish TB, and the fish should be euthanized. Not comfortable with that. There is no practical way to POSITIVELY ID the problem as mycobacteriosis. There are also other family members even more sentimental than I am about the fish. (The frogs are my babies, and I am sure as hell not going to off them even if they start showing clinical signs).
Going to stop treating with Wardley's as it has had no effect, and is not really good for bacteria. Came across some info that it may be possible to knock the infection back to sub-clinical with Kanamycin and Vitamin B-6. Will post occasional progress reports. If nothing else, maybe someone else with the same problem can learn from our experience.