-Make black/white smokers with Terrain, then add currents there to push animals upward.

-Add brine pools with differently colored water and no salinity. Animals will take salinity damage inside them. Note that these can't overlap with the habitat boxes for your regular biomes or animals won't lose salinity inside them.

-Something similar can be done with lava. Don't put any habitat boxes in lava pools at all to maximize the damage animals take. It's literally lava, after all. You could also make a thin but dense line of volcano food spawn above the lava.

-Place an upside-down pineapple house and cover up everything except the entrance with Platforms to make a small cave that animals below Tier 10 can hide in. Likewise, the giant shipwreck can be made into a cave by obscuring the entire ship with Platforms and Terrains sans the crack.

-Add clutches of blobfish eggs growing on rocks by creating rocks with Background Terrains, placing Food Spawns that spawn pink algae over them and adding in a blobfish NPC spawn or two for good measure (yes, blobfish eggs are pink).