The new Hydro one seems pretty good so far and is cheaper then most other options mentioned but you have to supply the pump but likely have a maxijet or similar lying around.
I like that the controller is water proof or at least water resistant. I spilled water on my tunze controller once years ago and that was it. It is probably still the best in that you take a few ml out and it comes on. The hydro one there needs to be a very slight drop in water level but more significant. Not enough to effect salinity but I don't think its coming on anywhere near as much as a tunze or jbj.
The JBJ seems pretty good too, I also use one of these on my pico. I recently had a sensor die for no apparent reason but it was going for several years and since I only use one I simply swapped it for the other one and its back to working great.
Really any option is better then manual.
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