Substrate or bare bottom

[Quietman]

I do love my Goby and Shrimp (only named fish in my tank - Grouch and Dozer). What I really love about them is how my grand kids always get excited to see the pair of them. The lookout protecting the shrimp from all comers and the shrimp digging a hole under the rock work piling up sand all over my zoas. Totally worth it!