09-25-2012, 01:33 AM
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I dont know what is causing the flashing. May be the pH, may be a irritant from the fungus, or therein related.
I would not do large water changes in a short time frame. I think the rapid pH shift will be detrimental to your fish. It is obvious pH is high from tap, find out what your tap water pH is and it will give you an idea how much it will move. Google around for pH stabilization formulas. If you cant find anything to help you figure out where your pH will go, post your pH current for both tank and tap. I or someone else with some chemistry knowledge may be able to the equation for you.
but right now you want to do SMALL water changes somewhat frequently. I say do 5-10% changes 2 / day every day till stable. It would be best to have your pH stablize, but may not be good to use chemicals to do so. I dont have much experience with rapid pH change. hopefully someone who does will advise.