Dark tank is a great idea. floating for 15 min is fine
proper Drip method is add fish to small bucket, check SG
of water from LFS
then check your SG
. Now if they are the same then drip for at least 1 hour then release. If they are not the same drip 1 hour check SG
of bucket if not the same as tank dump some water out and continue drip for 30 min check again if the same I drip for another 30 then release. You need to check SG
of the water to make the drip method successful other wise it is just like adding to water in floating bag. I cover the bucket with a towel keeping the fish dark. i sometimes put a heating pad under the bucket to help keep the temp up.
have a low SG
around .019, .015. Me reef is .025 so i need to drip my new fish for around 3 hours to get a proper acclimation. I have been very very successful using this method and the guys in my Reef club all use the same method with great success.