PLEASE NOTE: NEVER do drip acclimation especially with fish that have been shipped and spent any length of time in the bag with water - why? ... the water in the bag becomes slightly acidic so lethal ammonia is converted into relatively harmless ammonium. (a good thing since otherwise the fish would likely die in transit!). If you introduce water with drip acclimation, the ammonium will convert back to lethal ammonia and potentially kill the fish!!!
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Note: drip acclimation was originally thought to slowly introduce fish to a different water chemistry. However, experts agree that it takes fish several days or even weeks to acclimate to a different water chemistry so drip acclimation just isn't effective...besides, for shipped fish, as mentioned above, serious harm to gills and/or death can occur.