Ya I wouldn't recommend hot water and I don't think the same applies to the little cubes since they pick at the unthawed parts. Correct me if I'm wrong but were talking about fillets and shrimp? Everyone have their own tricks, and mine is definitely flawed as I feed late at night and it isn't fun when I forget about a cup of water with raw shrimp overnight. I do know however it is uncomfortable to eat something frozen and my body temp is regulated around 98. If I was coldblooded and couldn't regulate my temp and all systems slowed when it cooled, I'd probably prefer thawed food. Not saying frozen food is bad, but I don't think it has any benefit, I used to feed frozen for years, but shrimp tails are easier to remove thawed and the food sinks which is good for certain fish