I saw a good opportunity to snap a couple pics of 2 of the breeding size crays in the 30. Still waiting for eggs to appear. Other residents are another orange male, 2 more orange/brown (brown) females, several wild color snowball shrimp, and a few (relatively) snails. I've been thinking about adding some spixi snails for variety, with the MTS and ramshorns.
The rocks are mostly limestone and shale, and have been used previously in other aquariums. I also keep African cichlids, so I have collected quite a few rocks for the tanks over the years. Any soluble iron would likely have leached out long ago.