Made a few adjustments, including some conceptualizing of a kind of "becoming your environment" thing -- since they're pollinators and all.
@Keenir: Thanks XD The Squidofly is born. As for the legs... crab legs are skinny...? Haha. Seriously though, I imagine that in open water they'd be used more as stabilizer, latching onto the coral/underwater plants. I imagine the creature swimming (with its fins) more than walking along the sea floor. As for its work in the shallows, the legs bend in such a way to lower the body/center of gravity, with the fins still being utilized. The legs are mostly for the stabilizing named above and combat.
And taking into account the second sketch, the frilo would likely stay very close to the sea floor, using his fins to swim and his legs to sort-of pull himself along the terrain.