MeGustaUnaPez926

I got home from a week long vacation today and I found one of my emerald cories with this large white dot on one side of her body. Heres my information
ammonia- 0
Nitrites- 0
Nitrates- <5
Temperature- currently 72, usually 74-76.
My tank has been set up since June or July, and I recently lost two three line cories to unknown causes, one I just found dead in the filter, the other had a couple seizure like things before she died. Neither had worms or a fungus when they died. And the temperature has been a little low, because we set the furnace to lower than usual when we left, but it is heating up now.
Tankmates- 2 honey gouramis and one other emerald cory.
Maintenance- I do weekly 20% water changes, and did a 30% on last Friday before we left. I also rinsed out the filter (with tank water) on Christmas. I usually do that once a month. I feed them a mixture of regular flake food, and these shrimp pellet things for the cories. I am going to start bloodworms soon. However, my grandpa has been feeding them for the last week, so I don't know exactly what has happened recently.
I have a 20 gallon tank and I use an Aquaclear 50 power filter.
I have my quarantine tank up and running, should I put her in there? I'm also worried she might get really stressed without her friend. She's already stressed enough because the rest of the cories died so there isn't really a school any more. I was going to fix that when I got back. It doesn't really look like ICH to me, maybe velvet? None of the other fish have the dot, but my other cory is swimming at the top of the tank, which I know isn't normal. The tank is cycled, but it was cycled using these two cories, which I know is bad. They haven't ever shown signs of it hurting them before though. I'll try to get up some pictures.
EDIT: I've been doing research, it looks like this- http://freshaquarium.about.com/cs/di...columnaris.htm
Any treatments you could recommend?

Shawnie

hmm the only really thing that I think should change, is your tank temps...they should be around 79-80 ish for the type of fish you have.....some stress coat+ would help heal and make him feel better..does it look like maybe it was picked on by someone? or even scraped up against something? I would make sure you know exactly what it is before adding meds...cories are sensitive to tank conditions and maybe just raising the temps would help alot with the continued water changes...I hope things get better!

MeGustaUnaPez926

I thought that cories needed 74-78 to be happy. The temperature has been low lately, around 70ish. Is stress coat+'s actual commercial name stress coat+? Is that something I could get at Petco? Should I quarantine her, or do you think that would be counterproductive. Will the stress coat+ hurt my other fish if I don't quarantine her?

Shawnie

cories and gouramis are tropical's and the warmer temps do best..70-74 is low and will stress them ....stress coat+ is something you can get at petco..it works as a slime rebuilder for their slime coat, an ammonia and nitrite detoxifier, a decholrinator, as well as other benefits...you can quranteen her just so she wont be picked on and the stress coat is great for all fish...its not a medicine its more of a natural vitamin per say

MeGustaUnaPez926

So should I or shouldn't I quarantine her?

Shawnie

if you think the other fish are picking on her, yes I would....if not,leave her be as the other cory might be her company for now and stressing her by being alone could do more harm....you as her loving mom would know best

MeGustaUnaPez926

I have never had any problems with my fish being mean. My other cory wouldn't, and I don't think the gouramis know that she exists! I'm trying to get my dad to drive to me to Petco now. Thanks for all the help.