Hey friends,
I’ve been struggling with a mystery disease that’s only affecting Cories. I’ve lost 3 over the last two months and the last death was 3 weeks ago.
Everyone seems healthy now (attached a vid of the 5 cories left). My worry is that their school is really small now (went from 8 to 5), so I want to add some more but am hesitant until I’ve identified the issue.
Background
The tank is a 55g freshwater planted community tank with 5 false julii cories, 20 cardinal tetras, 4 otos, and a boatload of shrimps (amanos and cherries). The tank is about 6 months old.
Params:
Temp: 74.5 / Ammonia: 0 / Nitrite: 0 / Nitrate: 5 / pH: 7.2 / Gh: 80 / Kh: 120 / Chlorine: 0
The issue
About a month ago, one of the cories had swim bladder issues. I tried feeding peas and an epsom salt bath but unfortunately I lost him.
Fast forward to three weeks ago. I found one cory dead and another with his tail floating up. I’d been super sick for the last two days after a work trip, so I didn’t see if the one that passed had swimming issues, so that is an assumption on my part. I gave the one with swimming issues epsom salt dips over a day or two and it seemed to help a bit but I lost him. Is there something that would cause swim bladder issues in cories but none of the other fish? My water quality is unchanged and I’ve got masses of shrimp babies.
Possible cause?
I don’t overfeed but I’m curious if maybe the way I feed is causing problems. I only feed every 2-3 days to try and keep my snail population at bay and I’m wondering if it’s possible that because they’re hungry, they’re gorging and getting digestive issues. I fed on Thursday when I got home from my travel and had the death right after.
Anyone have any ideas? I posted on Reddit and didn’t get any help. I changed my feeding habit to smaller amounts every day and everyone seems happy although I did have a gap between the first and second deaths as well.
for some reason I can’t attach video, so here’s a Dropbox link.