aquatic mobs for my mod

if you saw my other posts this is very different from the things i added mostly blocks. but the mod is a bit of a mix bag of additions thus im here to show my UNFINISHED mobs (will do the textures later and put them into another post plus some more) AQUATIC mobs because there will also be land mobs
so anyway
1.nautilus
"wait arent those like already added in game?" well yes but i use the 1.20.1 version so i dont have them plus mine are more like underwater "decoration" but they'll occasionally attack drowns since irl they tend to be scavengers but also are opportunistic predators so they'll attack them if attacked they go into their shell like a shulker you can sort of put them in a bucket for carry plus they'll eat all rotten flesh so thats one way to get rid of it or maybe use them to kill drowns 
2.Horseshoe Crab
i added them because i find them cool so theyll hide in sand that is one block under water (something they sorta do irl on the shoreline) the sand will become lively sand sand a bit animated you can brush to pop them out or you can wait until night where they get out they'll molt giving you a molt fargements combine it with a turtle helmet to get a bit of an upgrade sort of similar to the diamond helmet protection plus 20 seconds of underwater breathing you can shift+right click on them to pick them up to carry or put it on your head but it wont be an effective helmet
now a big one a bit literally 
3.water isopods!! or the pill bugs underwater familiar
so like horseshoe crabs they'll hide in deep gravel blocks they'll occasionally pop out or again you can use a brush them out 
ok so they'll be either small or medium sizes the small ones will become medium ones naturally they'll mostly stay in the "ocean" floor where they do eh... nothing because i couldnt think of anything XD
*small
*medium
BUT! if you grab a small or medium one you can feed it fish rotten flesh and other stuff to get this chunky boy! (player for scale) a underwater mount!! "but hey isnt that like the nautilus in newer versions?" and i say YES but i made them for underwater mining and exploration like underwater caves like other mounts they'll have a boost when space bar is held