To all the haters: right energy, wrong focus. Lay off this guy. He collected a few specimens from the beach. Big deal. Do any of you know the actual survival rate of any of these animals in the wild? I think, for most marine life, it's something like 1/10th of 1%. Why do you think they produce hundreds of thousands of eggs per spawning (even millions, in some cases)? Because, the vast majority of them die before they reach reproductive age.
What the OP did was merely play a part in the cycle. The only problem is, he's not eating these creatures and returning their energy to the cycle. If he was a seagull eating these things, no one would have a problem with these creatures being taken from the tide pool. Instead, he took them and is *gasp* trying to keep them alive. How dare he?
Would they have lived in the tide pool? Maybe. Would they have died being exposed on the beach? Maybe. The point is, we don't know what would have happened to the critters. But, I can tell you this, this person removing them had absolutely zero effect on the overall survival of the species in question.
This brings me back to my original statement of "right energy, wrong focus." There are far fewer people bringing home live critters from the beach than there are individuals or commercial entities harvesting vast numbers of organisms from the ocean. There are even greater numbers of "entities" altering the environment in such a way as to have negative impacts on the populations of all organisms, in all ecosystems throughout the world. If you really care so much about the environment and want to make a difference, write your local politicians. Write to companies that exploit our world's natural resources. Boycott their products. Don't throw anything out. Reuse all of your garbage and don't ever buy another drop of gasoline, ever. Ride your bike to work or, even better, walk. And, please, don't ever buy another bottle of bottled water again....ever. But, please, I beg you...don't waste the energy and words on a guy who took a few critters off the beach.
And, before you jump all over the next guy who posts he took something off the beach, reexamine what you do everyday and how it affects the world around you. If you truly feel that you're squeaky clean after that self-reflection then, by all means, blast away. But, if everyone that posts here has an aquarium, I can tell you right off the bat that you have blood on your hands and have no right to lambaste anyone for taking a creature from the wild.