FIN NIPPING OR FIN ROT? A DISASTROUS UPDATE
Hi all,
I've been monitoring the fish since adding more rasboras and pygmy corys, and I've noticed that my green neons (and possibly the odd cardinal that slipped in) are
extremely aggressive with each other. I've gone from seeing 8 tetras regularly to only 6, and they are hounding each other around the tank. The neons look paler than normal too, so I'm guessing they're stressing each other. I have a well planted tank, but apparently not well enough!?
I've also noticed they are particularly
picking on the pygmy corys, to the point where the fin loss on the smallest one is extremely noticeable. Poor thing is missing the bottom half of his tail fin and almost all his dorsal fin
🙁
^the severely finless Cory ^
As I was watching, 2 of the tetras stopped chasing each-other and went for the cory. I know there's one other cory with raggedy damage to his tail, however I assumed this was from the store and was monitoring.
^ the raggedy Cory^
The other corys look totally fine and healthy.
^ a healthy Cory!^
The corys are all feeding and swimming, resting on leaves together/separately etc, but I do feel they might be hiding from the tetras. The one with severely missing fins is also swimming and feeding, although with some clear effort.
The tetras are bothering the rasboras too, but the rasboras are better at evading them than the corys.
This behaviour would point to
fin nipping. However from looking at pictures, I'm wondering if
fin rot is affecting the corys?
The neons do have some small white marks on their fins, which could be ich.
^very hard to photograph but you can see the white spots^
Here's a video to make it a bit easier.
Green neons ich?
I have a feeling its probably from bites, however I can treat with esha exit just in case. I'm reluctant to do this until I work out what's happening. All of the rasboras are completely devoid of white marks and aren't showing any signs of fin damage. In fact, they're fat, brightly coloured and healthy!
1 cory arrived from the store with a pale mark on its back, however I've been monitoring this one and it's the biggest and healthiest. The pale mark has not grown/expanded.
^ Pale marked Cory in front^
I do have a lot of mulm at the bottom of my tank and have noticed some algae recently, however I'm assuming that's because the tank is getting more natural sunlight - I'm upping frequency of water changes just in case.
I feel like the tetra's feistiness is more noticeable at night/after the lights are off? I'm unsure if this means anything. I don't have a quarantine tank, however I could set one up pretty swiftly to separate out the neons- it's definitely not a long term solution though, I don't have the space. I feel like the result is going to be that
I give the green neons to someone else, or back to the LFS. Can I even do this!? gutted tbh, I really don't want to create a stressful environment for my fish! This is definitely not ideal.
any advice for what to do?
(Edited to add photos and fin rot query)