Rendered in cycles.
Assets-
Chevalier Sword (https://skfb.ly/6QVw7) by rubenve is licensed under creative commons attribution.
Pond Weed (https://skfb.ly/oywXV) by valeri.ly is licensed under creative commons attribution
Guppy Fish (https://skfb.ly/6ACrN) by BlueMesh is licensed under cc sttribution
Breakdown -
workflow timelapse -
Other render passes -