Genshin Impact: All 55 Hydroculus in Fontaine V4.6

Genshin Impact has a new Fontaine area expansion and as one can expect, we have new batches of Hydroculus to collect. In version 4.6, we have a small patch of land in Fontaine and a whole underwater area similar to Enkanomiya. There are a total of 55 Hydroculus in these areas, and this will mark the end of Hydroculus collections as you can then level up the statue to Level 10 with 1 extra Hydroculus in Inventory. If you missed out the previous guides, you can check below:
1) All 85 Hydroculus in Fontaine V4.0
2) All 65 Hydroculus in Fontaine V4.1
3) All 66 Hydroculus in Fontaine V4.2

Remember to complete the whole Canticles of Harmony quest to unlock all the areas in Sea of Bygone Eras. After that, you can collect all Hydroculus without any hindrance.

All 55 Hydroculus in Genshin Impact Version 4.6

9 Hydroculus in Petrichor

1. Teleport to waypoint #1 and head northwest to Contarini's house. The Hydroculus is on top of her house.
2. Teleport again to waypoint #1 and look east. The Hydroculi is on top of a pillar beside a single tree.
3. From previous spot, turn 180 degree and climb the mountain to the top.
4. Teleport to waypoint #2 and go down the stairs. Use the Mysterious Grimoires (tap T to use power of symphony and tap E to stop the grimoire mid-air. after submitting, hold E to move the books) to open the path towards the Hydroculus.

5. Go back up the stairs and dive into the water opposite of the huge stage. There is one Hydroculi in the water.
6. Dive upwards and go to the huge stage. One Hydroculi is on top of the pipe instrument.
7. Teleport to waypoint #3, go down the steps, and look to your left. Keep following that direction until you reach a small library/office (you should walk pass a golem guarding an Exquisite Chest). Once you're in the room, go up the stairs towards a blue crystal and hit it. Board the waterplanks until the end and you will see another small area locked behind a Mysterious Grimoire.
8. Teleport to waypoint #4 and turn around to see a Hydroculi between the crack of the wall.

9. Just across the Legatus Golem boss. You can defeat it first or just go around the arena to avoid battling him.

20 Hydroculus in Sea of Bygone Eras (West)

10. Teleport to waypoint #5 and look below the waypoint to see one Hydroculi.
11. Teleport to waypoint #6, swim southwest upwards and search for a Hydroculi between 2 tall rocks.
12. From previous spot, dive downwards and you will see a path leading towards a dry land (called Caesareum Palace). You can see one Hydroculi at the entrance.
13. On top of a statue just after a lil' walk from the waypoint inside the palace.

14. Look at the huge gate in the Caesareum Palace, and climb towards the top of that gate for another Hydroculi.
15. Teleport to waypoint #6 and look to your south for another path leading to another patch of dry land (you should have reach this place during the Canticles of Harmony quest). Go behind the stone pillar and break the breakable rock for the Hydroculi.
16. Teleport again to waypoint #6 and swim upwards in the direction of southeast. You should see a Hydroculi just below a protruding rock pointing downwards.
17. From previous spot, swim even higher to the top of the rock for another Hydroculi.

18. From the previous spot, swim downwards (really downwards) toward the pink coral reefs. There is one Hydroculi on top of one of the reef.
19. Teleport to waypoint #6 again, look a bit to your east to see a current (circle water current that will boost you underwater). Enter that current once and you will see a Hydroculi under an opening of a rock.
20. From the previous spot, look to your north and swim in that direction downwards. The Hydroculi is hidden under a pink reef.
21. From the previous spot, swim upwards (really really upwards) until you reach the top rock to see another Hydroculi.

22. Teleport to waypoint #8 and swim northeast towards behind a huge rock.
23. Teleport to waypoint #7, turn a bit to northwest and you should see a Hydroculi on top of the protruding rock.
24. Teleport to waypoint #9 and you should see a Hydroculi just a little bit to the south under a reef.
25. From the previous location, swim west upwards (really upwards) until you reach the top of the rock.

26. From the previous spot, swim northeast (at the same elevation) until you see a Hydroculi in between a rock.
27. Teleport to waypoint #10, turn south and walk towards the path until you see a Hydroculi floating on top of a statue. If you didn't unlock waypoint #10 yet, go to waypoint #7 and swim north downwards until you see a circle water current. In front of that current is the entrance to the cave (you should have reach this place during the Canticles of Harmony quest).
28. Teleport again to waypoint #10 and walk forward to the direction of the Luxurious Chest surrounded by Seelie's monument. Enter the water teleporation to reach the huge bell with Hydroculi near it.
29. Dive in the water in under the bell and continue swimming until you see a Hydroculi on top of a statue.

26 Hydroculus in Sea of Bygone Eras (East)

30. Teleport to waypoint #11 and swim east towards a pink shell. Hit the shell for the Hydroculi inside it.
31. From the previous spot, swim southeast upwards until you see an orange coral reef. The Hydroculi is on top of that.
32. From the previous spot, swim north downwards where you see lots of pink coral reefs. Look for a breakable rock under a coral reef and break it using Xenochromatic Armored Crab's ability.
33. Afterwards, swim upwards (really upwards) until you see the huge pipe instrument. The Hydroculi is on top of one of the pipes.

34. From the previous spot, look northwest (at the same evelation) and you should see another Hydroculi on top of the underwater mountain.
35. Teleport to waypoint #12, look to the west and swim upwards until you reach top of the pipe.
36. Teleport again to waypoint #12 and turn around 180 degree. You should see 2 Auric Anglerfish surrounding a Luxurious Chest and a Hydroculi inside a barrier. Behind each anglerfish are 2 Washer Octopus. Interact with them and they will lead to respective challenges. Complete those challenges to remove the barrier.
37. From the previous location, swim southwest until you see the Hydroculi near the Xenochromatic Blubberbeast.

38. Teleport again to waypoint #12, turn around in the direction of previous Luxurious Chest that were surrounded by the 2 anglerfishes. There is a path just underneath of the pink coral reef that has that Lux Chest (you should have reach this place during the Canticles of Harmony quest). Enter that path and keep walking until you see a Hydroculi in between a broken pipe instrument.
39. Teleport again to waypoint #12, swim southeast at the same elevation until you see a Hydroculi on top of a huge seaweed.
40. Teleport to waypoint #13, look downwards in the direction of northeast and you will see the Hydroculi on top of a small protruding rock.
41. From the previous spot, swim upwards (really upwards) in the direction of southeast until you see a Hydroculi on top of a tall protruding rock.

42. From the previous spot, swim upwards again towards the east until you reach the top of the rock.
43. Now, swim downwards (really downwards) until you reach the bottom where you can see 2 Wonderchime Flowers. The Hydroculi is in between the 2 flowers.
44. Teleport to waypoint #14 and look to your north to see an octopi just below a Hydroculi.
45. From the previous spot, swim downwards in the direction of the west until you see a breakable rock. Break the rock using Xenochromatic Jellyfish's ability.

46. Teleport to waypoint #14 again and swim southeast towards a pink coral reef for another Hydroculi. There's a purple Bubbler Seahorse near the Hydroculi.
47. From the previous spot, swim really downwards to the southeast until you see a sealed treasure chest guarded by a Sternshield Crab. There's a Hydroculi near that crab.
48. Teleport to waypoint #15 and turn around to see a Hydroculi in between a broken pillar.
49. Swim east and look downwards to see a breakable rock. There's a Xenochromatic Armored Crab's nearby so use its ability to destroy the rock and get the Hydroculi underneath it.

50. Teleport to waypoint #16 and swim forward until you see the Hydroculi.
51. From the previous spot, swim downwards until you see a pink shell. Attack the shell to open it and get the Hydroculi inside it.
52. Teleport again to waypoint #16 and turn around to see the whole pipe instrumental ornaments. Swim past the highest pipe and you should see a Hydroculi hidden in the corner of the building.
53. Teleport to waypoint #17 and walk to the stairs for another Hydroculi.

54. Teleport to waypoint #18 and turn around for another Hydroculi.
55. Teleport to waypoint #19, walk past the Vishap and climb the pillar for the Hydroculi.