The best way IME is to drain the tank water down to 6-8" and lay a bucket sideways and use a net to kinda herd the fish into the bucket. Then just pull the bucket out. Way less stressful for fish and owner.
Yea I've done that but the fish tear eachother apart when they are all in a bucket..... I do drain the tank tho and it works, just need a backup net!
Go S. Vettel #1 rb8