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Black Neon Tetra with missing vent?

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Hey there,

About 3 days ago I noticed my black neon had a prolapse and had a protrusion under her vent. I used some Methylene blue and Epsom salt to help, after 2 days she expelled a few eggs and a day after she has a triangle-shaped hole under her vent. She doesn't appear to be stressed but not sure if I should euthanize her. I have also used Stress Guard from Seachem as an antiseptic.

All the fish are usually friendly, the rasboras, black neon and neon tetras are always schooling together, the Dalmatian mollies are very friendly and show no signs of aggression towards other fish. The snails, corys and loach mind their own business at the bottom and are very peaceful.


Current Water Parameters

Nitrate (NO3) - 25mg/l

Nitrite (NO2) - 0,2mg/l

Total Hardness (GH) - >4°d

Carbonate Hardness (KH) - 4,5°d

pH Value - 6,9

Chlorine - 0mg/l

Carbon Dioxide (CO2) - 35 mg/l


Tank Specs

130 L

Temperature 24C

Gravel - 0.5mm - 1cm size

Live Plants (Around 25 blue hygrophila and a hand full of java moss)

Filter - Aqua One Aquis 1200 - Media is replaced every 2 months

Water change 25% every 6 days


Tank mates

1 Borneo Loach (male) 2 years old

4 Julii Corydoras (All females) 5 years old

3 Mystery snails (2 females and 1 male) 1 year old

5 Neon tetras (3 females and 2 males) 1 year old

3 Black Neon tetras (Including her) 1 male 2 females 1 and a half years old

10 Molly Dalmatians (1 adult couple) Rest fry from the female 7 months old and fry around 1 month old

3 Harlequin Rasboras (2 females and 1 male) Around 2 years old











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Thank you for such detailed information about the fish and its tankmates and environs.

If the fish doesn't appear stressed, and is otherwise eating and acting normally, then I would leave it as it is and it may heal by itself.

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