dwarf cories dieing

nothing is visible on them while they are alive. although, when they die, a white fuzz grows on them.... if it was an infestation, what should i do to make the tank ok for more fish? if the fish that are left just don't die, will that mean it's ok?
 
i just thought of something: i recently added a small clay pot for a cave. it used to be used for plants, but i cleaned it thoroughly, with soap, and then let it soak in a bucket for 3 days, changing water once a day. could it possibly have carried anything with it then leached into the water and killed the fish? anyone have experience with that happening?
 
Ooooh. Yeah, that can happen. Many house plant fertilizers are not aquarium safe, and if the house plant was fertilized, that would have soaked into the clay, and leached out under water. The soap you washed it with wouldn't have removed any of these, and in fact could have been absorbed by the pot as well.

In the future--use brand new pots only. Don't wash porous things with soap--even using bleach, and then rinsing and dechlorinating is a safer option. Sorry!
 
i see.... i was about to buy a new pot and my mom was like: we have plenty of pots at home, don't buy a new one! i guess i'll take the pot out, and get new. thanks for all the help, i think we finally figured out what the problem was.
 
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