I acclimated for 2 1/2 hours using the drip method. He was swimming around fine the first night with a clown I also just got. I have a yellow tang, a couple damsels, & a bicolor blenny I've had for over a year. The clown, niger trigger survived the acclimation, but the my bursa trigger & atlantic tang died. My tank has been up for five years & the only immediate problems I've had with new fish have been from saltwaterfish.com! However, it is winter now & my priority shipment didn't arrive until 4pm-whatever....