Hmm alright I'll take a photo or a video of the entire water flow system when I'm free!
Its a possibility... corydoras can actually swim to the water surface and take gulps of air to store and use (they hold the air in their stomachs and the oxygen dissipates through the thin lining), thats how they can survive in lower oxygen environments.
If your 2 other rainbow fishes are gasping at the surface, then quickly run an air stone to improve oxygenation in the tank.
I still do find it abit odd that just 2-3 rainbow fish would encounter oxygen issues in a large volume 4ft tank (if thats really the case, then your tank setup will really need some adjustments to ensure sufficient oxygenation, especially since you plan to add even more fishes in the future), maybe also check your tanks ammonia and nitrite levels again just to make sure its not due to spikes in those parameters.
Btw, do you have any photos or video of the sump filtration and also the overflow section and the ouflow pipe? Just curious to see how how its setup and the possible tweaks that could be done.
Hmm alright I'll take a photo or a video of the entire water flow system when I'm free!
Hey so this is a few photos of the sump and where the water overflows!!
ImageUploadedByTapatalk1445522806.585839.jpgImageUploadedByTapatalk1445522817.108730.jpgImageUploadedByTapatalk1445522886.638822.jpg
And here's a photo of the newly added air strip!!
It's effective and it's pretty
ImageUploadedByTapatalk1445522954.321183.jpg
Alright it's been a couple of hours but why is my neon dwarf rainbow still at the surface
Also, I tested my ammonia and it's around 0-0.25ppm
Well looks like oxygen wasn't the issue...
Another one died this morning and the one at the surface is still at the surface. THATS 5 DEAD OF THE 6 I BOUGHT
Is it cuz of ammonia??? Is 0.25ppm too much for them??
When I bought them from Arowana avenue, they still look rather lively and active. Why is it that they are only dying and swimming at the surface in my tank...
Best to still run the air stone just in case. Btw, you can also run the air stone or air strip inside the sump tank too.
Seems like it could just be weak fishes that couldn't survive the transition, sometimes that happens. I have bought tetras from one LFS which died within a short time and then bought tetras from another LFS which lived on for the next 2+ years (both in the same tank conditions), so it could also be a batch issue.
As for your ammonia levels, you can do more frequent and larger water changes to help reduce it. Adding more fast growing plants or floating plants will also help to consume it too.
Do also check if your tap water itself has ammonia content too, because some place may exhibit this effect (especially those buildings with older water pipes and water tanks).
Just an update! My last dwarf neon rainbowfish has recovered and it's no longer Swimming at the surface!
It's swimming around the rest of the angelfishes that I have!
Looking to get more soon if not the fish look so sad being alone. But I'm still trying to find where has good quality neon rainbows... If y'all know where can find please let me know!!
Recently I saw some at Bishan Aquarium. Best to call and confirm before going there.
I'm LFS hopping now HAHA from Y618 down the red line to Toa Payoh. So might as well take a look there!
Thanks btw!! Almost missed Bishan in my plan
Whoa amazing. I bought 5 neon rainbows today from Bishan Aquarium. They may not have the cleanest looking aquarium but their Neon dwarf rainbows were only $1 each!!! Let's hope they don't die this time
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