05-09-2013, 04:15 PM
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I need the other information I asked for, please. Diagnosing a fish problem is not easy, as there are so many factors. When you get sick and go to the doctor, he can't help if he doesn't find out all the facts. So here too.
But, having said that, the short time span of new fish would tend to suggest a parasite, and likely ich. Raise the temperature to 86F and keep it there for a week. Carefully observe the fish to see if any white spots appear; these usually first show on the fins. Ich first attacks the gills where we can't see the spots, which is why the flashing is indicative as a first sign.
But again, many other issues can cause flashing. Only 3 weeks ago I had to deal with gill flukes [interestingly the first time I've seen this disease in more than 20 years] and the first indicator was flashing. It is always wise to check everything to avoid incorrect diagnosing and treatment, as this can make the problem worse if we err. For instance, with gill flukes the second symptom is very increased respiration, and in this case, raising the temperature makes it much worse because the fish are already having trouble getting oxygen, and the warmer the water the less oxygen it holds.
Last edited by Byron; 05-09-2013 at 04:17 PM..