Summary

Edit:
Finally finished the mats, so adding them to the files. They aren't STL but they still load in Cura for me, so hopefully they work for you as well. The STL converted file was too big to upload. Oops! I used dungeonstick's ocean coral for the fun details around the outside to add some fun flare. An the center has pegs to hold the coral pieces in place so a bump won't tumble them over as easily. There are 2 different boards, print 1 starter, and 3 of the other ones. In order to fit snuggly in the box, I flipped over 2 of the boards and nestled the coral parts into the coral of the other 2 mats. This way they fit perfectly into the box.

Remixed the reef game box because i liked these the best of the options, but i also wanted to change up the rest a bit. The counting tokens annoyed me, so i used these counters:

https://www.thingiverse.com/thing:5588818

then i created a little storage box for the cards and counters that fits with the shrunken boxes.

It also leaves a spot for the game boards, and I plan to add some 3d printed boards soon, just need to test them to make sure they print well. (These have been added now)