We may need some more information:
What kind of fish is this?
Where did you get them from?
If mail-order, how long where they in shipment?
Do they breathe heavily?
Are they upright or laying on their sides?
Also, it would help if you could get some better pictures.
As for what it could be:
- Ammonia burn
- bacterial infection
- Brooklynella
- Amyloodinium
What kind of fish is this? Zebra barred Dartfish
Where did you get them from? liveaquaria
If mail-order, how long where they in shipment? less than 24 hours
Do they breathe heavily/Are they upright or laying on their sides? They start upright than once they lay on sides they are breathing heavy.
Also, info as requested by the sticky:
1. How old is this aquarium?
2. If less than six months old, what is ammonia level?
6 month old cycled QT, no ammonia detectable (Red sea pro)
3. What is SG of this aquarium? How measured?
1.018 matched to Live aquaria shipping salinity (Verified with refractometer)
4. When was the last fish added to this aquarium?
Added yesterday, 3 zebra barred darts. Only fish
5. Was it quarantined? If so, how? And how long? Was it prophylactically treated? How?
Added to QT 36 hours ago
6. If you are using a copper based medication, which one? How often do you measure level? When?
N/A
7. If you are using hyposalinity, how did you calibrate your refractometer?
N/A
8. Please describe in detail, the appearance of the fish? If there is one or more pimples, are they lumpy? What color?
Some whitish streaks seen in pic. the first one to die came out of the bag with a reddish mouth but the others have not exhibited that.
9. Please describe the behavior of the fish as best you can. Is it acting reclusive? Is it always up towards the top of the aquarium? Is it avoiding light? How active is the fish?
The remaining fish started hiding in the PVC elbows, then progressed to where tho other fish started by laying on the glass. They were lethargic out of the bag and all three have refused food )( live blackworms, pe mysis, cyclop-eeze)
Thanks in advance!!