Looks good BUT is the rock resting on the sand or on the tank bottom? Sand dissolves -slowly but it does dissolve. Critters can burrow under rock too and the result is an avalanche.
Some guy on 3reef had an avalanche and the rock and 70 Gs of salt water poured through the broken glass at 3am in the morning onto his living room floor and furniture. He claimed he stacked his rock very carefully. Guess it wasn't careful enough.
Oh yes deff make sure they are on the glass on the bottom. you can use epoxy putty and super glue. But make sure the epoxy is water safe. I use water weld plumbing epoxy and gel superglue
Today I went to buy more rock.I added more rock but I think I should get the rock that's on the sand bed and put on top and add more sand to cover the first step.to give it a 2” sandbed.what do you think?