Red striped black ghost knives

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Lostocean

Aquarium Advice Newbie
Joined
Mar 10, 2021
Messages
1
Hello I’m worried about my Black Ghost Knives and hopefully someone will be able to help.

The white stripe on both BGK are bright red, otherwise they look and behave normally.
I’m not sure where the problem is, so will give as much information as possible:

300litre tank running for about 3 years.
Aqua one canister filter CF-1200

BGKs are 2 years old, 24cm and 20cm
Haven’t had an aggression problem with either of them they generally stay to their own hiding spots and avoid each other during feeding.

Shared tank with a danio, 2 bristlenose cats, gourami
And many New Zealand pond snails (not supposed to be here)

Water changes 50% every 2 weeks

Temp 25-26 degrees
pH 7.4 (same as my tap water)
Nitrite 0.0ppm
Ammonia 0-0.25ppm
Nitrate 5ppm

Additives
API tap water conditioner (water changes)
API stress zyme+ (water changes)
Flourish and Flourish excel (infrequent and not recently)

Food:
Blood worms
Aqua one cichlids pellets
Pisces tropical flakes

Plants:
Water lilies
Anubis
Unknown plant from fish shop (can be seen in photos)

Thanks in advance
 

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