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@mikem is your guy for advise or potentially doing the work
Strip off old decking and check condition of joists/beams....replace as needed.
New decking, consider composite decking....Trek is a popular brand, but they are really all the same. If you wish, you can blind screw the new decking...
FYI, if you borrow my chiller, it's soooo underrated you most likely won't need a temperature controller......just a pump of between 100 - 160 gallons per hour.
Paulie, if you're in a pinch, I have a JBJ Arctica Nano (1/20 HP) (that I'm selling for $150), that you could borrow. It's most likely too small, but it could help getting the temp down a bit.
FYI, you'll also need a temperature controller (if not Apex or similar, a Ranco will do the trick)...
If Paulie doesn't do it, @mikem is your guy... he's a builder and great guy who has done a whole lot for this club.
And fyi, I'd use exterior sheathing for the walls. About the same cost of sheetrock, but can take the abuse. Excellent for garage walls.
My guess is that it's a moon snail.....either potentially euspira sp or neverita sp. Because you stated that it was huge when out of the shell, I'd guess more for the neverita sp.
Best off just calling it a moon snail....too many genius and species.
Paulie, might I assume you or one of your sea-worthy buddies are collecting these out of Jersey waters?
A little history.......a number of years ago we had an NJRC member who had NJ collected snails in his tank. Over a couple years, he'd occasionally break out in rashes, and a couple times...
A very common compass rose design typically hung on a wall. My guess is a Sandy washout from a beach house. Here are two examples of them for sale:
https://www.beachdecorshop.com/compass-wall-decor.html...