Hello everyone,
This is my first time posting in this forum, hoping I can get some insight into what happened.
In my 20 gallon community tank one of my corydora's had some fungal growth so I moved to treat it. My tank had 2 honey gouramis, 14 rummynose tetras, and 7 corydoras. I used maracyn and ich-x together and two days later all but 3 of my rummies died along with one corydora. I've had them all for about 3 months now with no issues. I dosed per the bottles one time and did not re-admister the doses after the first. I tested the water and it was 0/0/20-30 for ammonia, nitrite and nitrates.
This is the first time I had a massive die off so I'm pretty sad about the situation and want to prevent it from happening again. Let me know if there's anymore information I can give to help.