07-06-2012, 09:09 AM
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In very general terms, antibiotics can affect some or all plants, depending what it is and strength. And copper-based medications will affect many plants due to the increase of copper.
But before treatment, you should as someone suggested make very certain of the issue. All medications stress fish to some extent, and treating them with something that is ineffective only weakens them further.
Flashing is usually ich. Raising the temperature to 90F for a week can be effective on its own. I have fish that cannot tolerate this, so I raise it to 85F and use Coppersafe which is relatively mild. I have never lost fish or plants to this, and it has worked.
If you just see some flashing, but no actual white spots, I would not do anthing in the way of medication. Regular partial water changes of half the tank weekly, maintaining good conditions, not overfeeding--this can work wonders in the initial stages of ich. Healthy fish that are not under stress will (should) be able to finght off ich. The flashing is because ich first attacks the gills.