It is just a coincidence. Flourish does not give fish ich. With proper quarantine of new fish, ich should be non-existent in a fish room. In all my years of fishkeeping (keeping and breeding thousands of fish), I have only had ich 3 times, and two of those were with clown loaches.
Flourish will not give your fish Ich. When you use it is it in conjunction with a water change? If so is there a large temperature discrepancy between the tank water and the replacement water? What other stressors can possibily be taking place around this time? What are the curcumstances surrounding the time you add the flourish? Have you treated for ich? What have you used? How long did you use it? What kind of fish are you talking about? What are your water perameters and temperature? What quarteen procedure do you follow prior to introduction of new fish? Many questions to find the root cause.
I have a quarantine tank that sits at 84 degrees ammonia o. I do daily 20% water change daily. It happened to my discus tank that also sits at 84. Ammonia sits at 0 with about 25% changes daily. I have use flourish twice and both time my discus got ich. I'm not retarded I figured t was weird that's why I posted about it. I make all my fish sit in quarantine for a week before going into respected tanks. I have only had ich twice and it was when I added flourish. I no longer have ich just wanted to know if any others has similar reactions
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Because Ich can sometimes take weeks of months to cure, and there are dormant and invisible stages, it may be that you never quite cure it, and returns (or is noticed)about the time you add another dose of fluorish.