My neighbor has a new tank about 3 weeks old one of the reasons I started Mine he went yesterday and got the damsel clown fish Did the 45 minute water drip into a bucket with the fish to make him used to the water. But as soon as he put the fish in the water and 4 hours lateer the fish was sitting in the back on the bottom of the tank .I told him it was probably getting used to the tank but wanted to make sure?