Your dive buddies might get angry at you taking away some critters but fish and game won't care much as long as you don't take too much abalone. I live in NorCal and used to know someone who had a marine tank stcoked from the waters near Dillon Beach. Water, livestock... everything (he lived 2 blocks from the shore). And aside from the chiller and a skimmer he didn't need much else... The tide pools provided him with everything he needed in his tank. And he ran a 50/50 light strip for 8 hours a day. There are alomost no symbiotic anemone's in northern water, there's just not enough sunlight... so they all have to be fed.
He fed them chopped shrimp, a little formula 1 every once in a while and did waterchanges from the ocean which provided LOTS of plankton for food.
, his tank was ugly! Colorless, drab, cold and murky. But healthy! And fascinating as a piece of local landscape.
He said it was easier than a tropical reef, he'd done both for years, so he knew!