Puzzle #113 - Another Accidental Variant (Aquarium)

So... I misunderstood the rules of Aquarium slightly. There are 2 main variations on the rules relating to water level within regions. The simpler version, and the more common one is that the water level must be constant within a given region regardless of any barriers between columns. The less common version that's still treated as "normal" is that the water level in a region can be at different heights, as long as there are separate "pools".

However, I thought that it meant that water would only move sideways and down, never back up to "equalize" as it's supposed to. So this puzzle will not have a correct answer check, but if the only error thrown is about row 4, then you're good.

puzz.link interface   penpa interface

tl;dr Variant puzzle where water must move across and down only. Water level can be unequal as long as all possible across and down "spreads" are made.