Hello,
I'm writing because I'm very lost about this problem.
Before start with the problem, I will post the main tank information.
Tank
Current Stock
Maintenance:
Water Chemistry - Since I introduced fish, ammonia are always 0, nitrite 0 and nitrate 5 during nigth ate the end of the day (reach 10 after add ferts).
PH - 6,6
KH - 3
GH - 5
I need to dose Tropica Specialized when Nitrate is 0. Since Tropica Specialized has nh4no3 (ammonium nitrate), when I dose the week dose (20 Pumps), I have NH4 0,25 for 2 hours, and 0,15-0,2 nitrite 6h before all reach 0 again.
Now, the problem. All my Corydoras are acting strange, with a pale or skin deformation and fin rot, and keep dying.
My last introduction was 4 black Venezuela Corydoras and 10 Sterbei 2 weeks ago.
One day after the introduction of black Corydoras, one of them died (first stoped on the bottom and before died, started to swimming in circles and spinning without direction). 3 days after this, all my active Corydoras started to lay down on the bottom, most of the time, and only active during feeding or right after a water change.
In the first week or so, I lost 1 Julli and 1 Sterbei, and didn't see any external sign in any fish, only the strange behaviour of the Corydoras laying on the bottom most of the time. After one week, some of the corydoras has pale skin and as are losing skin and one And with strange skin too.
My lfs suggests 2 weeks of half dose (because corys and plants) of typical salt treatment (2 tbsp to 20L), and Myxazin. I start the treatment, but still losing fish.
Dead by now:
3 Tetra Cardinal - With white skin on tail
1 guppy - No external symptoms
2 Otocinclus - No external symptoms
5 Corydoras - No external symptoms
Today, I have spotted two Corydoras in bad shape, and for the first time, with real external symptoms.
At the moment I have already finished the 5 days treatment with Myxazin and 7 days with salt.
I don't know what to do more. Any Help?
Some pictures attached.
I'm writing because I'm very lost about this problem.
Before start with the problem, I will post the main tank information.
Tank
- 170cm long x 50 cm wide x 60 cm tall
- 510L
Current Stock
- 4 Guppy Endler
- 4 Guppy
- 15 Tetra Cardinal
- 6 White Fin Tetra
- 10 Black ghost Cardinal
- 10 Otocinclus (already lost 2)
- 10 Corydoras Sterbei
- 10 Corydoras Julli (already lost 1)
- 6 Corydoras Panda (already lost 1)
- 3 Corydoras Black Venezuela (already lost 1)
- 1 Garra Flavatra
- 20 Amano Shrimp
- 20 Red Cherry Shrimp
Maintenance:
- During 1st mouth - 60% water Change every other day
- Next 2 weeks - 60% wc every two days
- Next 2 weeks - 60% wc even 2x week
- After 2 months until now - 60% wc 1x week
- Never clean my bio media (sachem Matrix) and 1 bag Seachen Purigen, to avoid lose beneficial bacteria in the first months
- Cleaning Pre Filter Sponges every other week
Water Chemistry - Since I introduced fish, ammonia are always 0, nitrite 0 and nitrate 5 during nigth ate the end of the day (reach 10 after add ferts).
PH - 6,6
KH - 3
GH - 5
I need to dose Tropica Specialized when Nitrate is 0. Since Tropica Specialized has nh4no3 (ammonium nitrate), when I dose the week dose (20 Pumps), I have NH4 0,25 for 2 hours, and 0,15-0,2 nitrite 6h before all reach 0 again.
Now, the problem. All my Corydoras are acting strange, with a pale or skin deformation and fin rot, and keep dying.
My last introduction was 4 black Venezuela Corydoras and 10 Sterbei 2 weeks ago.
One day after the introduction of black Corydoras, one of them died (first stoped on the bottom and before died, started to swimming in circles and spinning without direction). 3 days after this, all my active Corydoras started to lay down on the bottom, most of the time, and only active during feeding or right after a water change.
In the first week or so, I lost 1 Julli and 1 Sterbei, and didn't see any external sign in any fish, only the strange behaviour of the Corydoras laying on the bottom most of the time. After one week, some of the corydoras has pale skin and as are losing skin and one And with strange skin too.
My lfs suggests 2 weeks of half dose (because corys and plants) of typical salt treatment (2 tbsp to 20L), and Myxazin. I start the treatment, but still losing fish.
Dead by now:
3 Tetra Cardinal - With white skin on tail
1 guppy - No external symptoms
2 Otocinclus - No external symptoms
5 Corydoras - No external symptoms
Today, I have spotted two Corydoras in bad shape, and for the first time, with real external symptoms.
At the moment I have already finished the 5 days treatment with Myxazin and 7 days with salt.
I don't know what to do more. Any Help?
Some pictures attached.
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