After changing the setup multiple times, I ended up with the below and plan to set up a 29 gallon tank in the next month or so to give them more room. I'll post that in a different forum.
Two pics of Helena in the magpie shell and light green (moldy?) turbo. Sneaky shellchanger! I still haven't seen it and she's changed into at least 5 shells now. She's the largest crab. Hermia is in the bumpy shell I have no name for yet (anyone?). Branch is not shown, but same shell type and half the size of Hermia. All 3 are small/medium PPs far as I can tell- Branch had just completed what I assume was a surface molt when I bought him. He was orange w sharp black tips, one bent leg tip, and is missing his big pincher. I think his deep crab modified shell saved his life, but that's just my opinion. Helena is a shell changer and not afraid of me at all. Very aggressive actually but not usually to the other crabs. Hermia's been hiding and skittish lately and I worry she has PPS. Only time will tell who makes it.
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We are now on the fourth and hopefully last change of substrate- 5:1 playsand:coco fiber wet to sand castle consistency with Instant Ocean saltwater. 5.5-6 inches deep. 2 pools that go down to the bottom, one fresh, one salt. Working on a better option than live rock coral for the freshwater. They like the sturdiness of the coral, but I'm afraid it'll make it brackish. I got scared when Branch fell in and couldn't get back out so I added the rocks in the bottom for traction, and then he could climb the coral. Maybe a piece of plastic cholla...
Ive got 80-87F and 80%+ RH and have read the care sheets for generic crabs and PPs. Still a few things left to implement, but I think it's pretty close to optimal for a ten gallon. Any suggestions or thoughts please let me know. I expect they'll be in here another month, two at most, but I'll probably keep it around as an ISO tank in case I need one.
Wanted to say thanks to everyone who has given me advice and help. I am so very grateful!!! Happy Crabbing!
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