Butterfly Gobys, Scats, and Monos are all high salinity fish. They migrate between brackish and marine waters for much of their lives. As far as scavengers are concerned, I would get Blue-Legged Hermit Crabs, and Asterina stars (very small starfish). The hermits and stars are excellent at higher salinities. I have also had luck with Malaysian Trumpet Snails at salinities all the way up to 1.019. Hope that helps.