30ft
Two different individuals, but same species
Very tiny
Found in leaf litter
Dive site Eden's Rubble (a.k.a. Front Porch), max depth 80ft / 24.2m.
On Creolefish cheeks. These isopods don't burrow into or take nutrients from their fish hosts [correction in comment below: they do eat some fish fluid], they just hang on tight and scavenge table scraps. Most of the Creolefish here had at least one of these.
Photographs by @cyberkittyn on Calabas Reef
2 individuals. One about 1m deep, the other about 10m deep.
Scuba Diving on Sampler Dive Site, Klein Bonaire with @julianclark
At Karpata off the island of Bonaire, in about 35 feet (10m) of water near the boat mooring is a family of up to five different common seahorses.