Hi everyone, I am no stranger to waterchanges, I do them every week. yesterday I went about my normal tank maintenance. I scraped the back wall of my tank with a razor blade, as I had an unusual about of green algae growing on it. My tank is near a window and I need new bulbs. The algae came of almost in sheets and my fish started eating it. Then I proceeded with my normal water change procedure. I checked the salinity, temp. and PH and everything seemed ok. Drained out 15 gals. like usual and notice I though my fish might be acting a little strange but honestly wasn't sure. I vacummed my crushed coral like always and then pumped in the fresh 15 gals that had been circulating for more than 24 hours. My tang shortly started darting around the tank in very short quick spurts. My clownfish started diving down at the substate and coming back up. Also the tang started swimming in very short circles. His gills and fins started turning white. My other fish seemed unaffected. I really thought I might lose my tang. Within 2 hours he fully recovered, and as far as I know all are ok today. The only thing I can think of is PH diff. to cause this. But I checked it ahead of time and they were the same. Since I don't know what happened I am scared of the next time I do a water change. Could scraping the algae have done anything negative?
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