Why are my koi and goldfish flashing or rubbing on the tank bottom?

Question

I have to young koi and a common goldfish together in a tank and I often times find them flashing against the substrate. I can’t seem to find any signs of ich either. Why do they do this or what are possible reasons as to why they do this? Pet's info: Fish | Unknown - Fish

Angel Alvarado, LVT · Accepted Answer

Occasional flashing can be normal. If it is frequent, check water chemistry first. Elevated ammonia levels can irritate or "burn" the gills. Sudden changes in pH can also result in increased flashing. Partial water changes using aged or conditioned water that is temperature matched can resolve imbalances in chemistry. Exam the gills closely for evidence of gill flukes, another parasite that can cause irritation and flashing. Gills may be inflamed or have mucous on them when gill flukes are present. You won't see them though, they are microscopic. Heavy breathing is also a symptom. Treatment is with praziquantel which you can find in the aquarium section of the local Petco.

Why are my koi and goldfish flashing or rubbing on the tank bottom?

Most Helpful Answer

Related Questions

My fish is stressed. Is covering the tank good for its recovery?

What fish dog food helps dry skin if my dog eats Science Diet?

White stuff on fish tank decorations: Is it algae? Will it harm?

My dog ate salty sardines for years. Are her kidneys or liver okay?

My new betta fish won't eat his pellets. Why is he spitting them out?

My fish has a fat belly and red tail fin. Is it dropsy? What can I do?

Share