Nice set up! Really like that plant on the left.

In the future maybe go with slightly larger river rock/pebbles (you can get a bag at any home depo, just gotta wash them clean of the clay dust). ACFs tend to scoop food with their hands from the bottom with their claws and that might mean one of those smaller blue rocks, leading to blockage.

The dwarf ones should be fine in pebbles you have right now but the large breed ones I'd worry about.