If you want to buy some liverock that just came out of the water, there is a company in Oldsmar that sells live rock. They may be a little out of your way depending on where you are in the county. They do local pickup there on Saturdays. I used them for just a bit of live rock and am glad I did. I bought their smallest package (the jar package) of basically a few smallish rocks and enough sand to replace what I had in my established 13 gallon tank. I ended up with a porcelain crab, chiton, a couple brittle stars, a few hitch hiker corals, 3 types of Caulerpa, and a couple small nuisance crabs I had to catch.Good call! I'll have to come up with a plan for where to find live rock.
Tampa Bay Saltwater: https://tbsaltwater.com/product-category/ups-rock-sand-critters/
Although it may not be a problem, my main concern with hermit crabs and snails from very shallow water is if they have some algae you don't want or cyano on the shells. I recommend brushing off the shells well and using a q-tip to wipe them down with hydrogen peroxide for maybe a minute to burn anything left off. But that's just me.
On the causeway to Honeymoon Island at a lower tide, you can often, but not always, find lots of small hermit crabs in the puddles. Don't take the tiny black snails though. I think they are nuisance snails. There is a great cheap food tiki bar on the causeway where you can sit at a table with your feet in the sand and watch the sunset over the water.
Also, if you go onto Honeymoon Island state park ($8 fee) there are thousands of rocks of all sizes that are agatized coral that is millions of years old. I use these rocks in the tank because you can get any size or shape and most importantly you can drill them because they are soft. I make frag rocks and can drill holes for rock anemones to live in if you want them to stay put. (except for the dog beach, the closer beaches to the entrance have more rocks, drive to the furthest beaches if you want sand.)
Small frag holder rock:
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