What Is This White Spot?

Discussion in 'More Freshwater Aquarium Topics' started by DanniD, Apr 9, 2018.

  1. DanniDValued MemberMember

    Hi, I have a school of lampeye killifish in an established 20 gallon tank.. I’ve got one who is the runt (so to speak) of the school that’s developed a white spot on the top of his body. Not sure what it is but it’s growing a bit and it looks like it’s eating into his spine? Like it’s indented?

    I thought it was a fungus at first but it didn’t respond to treatment. Could it be a bacterial infection? What is the best way to treat this?

    Temp: 80 F
    Ph: 6.4
    Ammonia, nitrites: 0
    Nitrates: 10

    Other tank mates: 3 chocolate gouramis, 2 german gold rams, 6 killifish, 4 otocinclus

    Last edited: Apr 9, 2018
  2. CosmicDodo42Valued MemberMember

    It could possibly be ich
  3. DanniDValued MemberMember

    No, I doubt it. The spot is much bigger and there is only one
  4. Discus-TangWell Known MemberMember

  5. DanniDValued MemberMember

    What makes you think it’s columnaris? I looked into it but I had a hard time diagnosing. What’s the best treatment?
  6. Discus-TangWell Known MemberMember

    Columnaris looks like that, (sort of like one big ich spot) and you can treat it with aquarium salt. When you see the disease gone do a salt flush.
  7. DutchAquariumWell Known MemberMember

    100%, it's columnaris. Your going to need to start looking for secondary infections and treating for those soon also. Most of the time the wish will get a bacterial infection after this and then dropsy. Be prepared. This is a hard disease to fight.
  8. DanniDValued MemberMember

    Thank you for the information! Unfortunately the fish didn’t make it. I’m worried about how contagious it is though.. should I treat my aquarium with a broad spectrum antibiotic to make sure things are ok?
  9. DutchAquariumWell Known MemberMember

    in general, bacteria infections don't spread unlike viral. You should be fine. If it makes you feel better to dose the aquarium, that won't do any harm either.