Is there a Cory Cat specific disease?

Question

I have had my 10gal tank for almost a year. A few tetras, couple cories and an autopleco. Except for one tetra at the begin of this setup all of my fish have been fine. Recently I noticed one of my cory cats appeared to have its main fin either bitten or deteriated. It was swimming good and eating well. I tried to see if any other fish had any sign of being bullied or any disease, but all appear fine. Yesterday the cory had red dots around its gills on both sides, but was still eating and swimming well. This morning he was dead. I do 20 to 25% water change a week and clean my filter sponges once a month in the water from the aquarium that I filter out. All levels are good. Please help, I don't want to lose the other two.

No, no carbon filtration in the tank any longer. I used it in the beginning of the cycle, but stopped using it after about 3 months.

Answer 1

What you are discribing could be any one of several bacteria diseases. None of which are specific to corys. These often start in the gravel bed and with corys in contact with the gravel far more than most fishes in the tank it would stand to reason they would show signs first. I would suggest continuing the careful watch on the fish to see if anything else develops, but at this point there would be no reason to treat the tank even if you could narrow the cause more.

MM

Answer 2

it rather is a probability your corys died and the different fish ate the keeps to be. it is likewise a probability that they are hidden someplace around decorations or under gravel. possibly in part eaten and then hidden. I actual have had undesirable stories with corys in the previous. each and every time i offered some (even from distinctive fish shops) they tended to demonstrate the indicators of columnaris, that can appear like cottony white mildew, in many cases around the gills. ultimately, all my corys died interior a week or 2. in view that then, i've got no longer long gone lower back to retaining corys in view that i won't have the ability to get a stable batch from the puppy shops and bypass with otos rather. i might say that in view that those ineffective corys mucked up your tank, your different fish have additionally more advantageous the ailment or maybe some correct ailments. From what I understand, columnaris is ordinary in corys and different catfish, so i might handle for that if I have been you.

Answer 3

In reading your question I could come up with two ailments that it could be based on your description.

The first one is ammonia poisoning which truly shouldn't be if you are doing all the maintenance that you say you are doing. I assume that you have sponge filters in your tank that don't contain carbon. If you have anything that does contain carbon. If this is the case and you are wringing them in the tank water, you could stand to do it more often. If you do have any filters that contain carbon in them(little black pieces of charcoal) Those need to be replaced every month.

The other is less a more likely disease often called Black Body. It's less likely because it normally only attacks members of the cichlid family. But parts of you description reminds me of when an angelfish of mine had it.(angelfish often don't change color when they get black body) This is a bacteria infection that can be cured with store bought antibiotics. But like I said, it's not really likely.