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Mostly Alk for me using a Hanna checkers, about 1x per week. Then my salinity after each weekly water change.
Calcium not too often, maybe 1x per month
I lost parts of my Salifert Mag test kit so I don't test for Mag (though I know I should)
pumps were very quiet and they do move a lot of water. With the controller i think they are worth it. I just hate that they cost substantially more than pumps themselves
I had one
Pros:
inexpensive for a bundle
No power brick needed
Cons:
Without the contoller, they have a "hard" start when trying to have them turn on n off.
Controller is expensive and for no apprent reason
Good pump on a budget, but if your looking for a wave effect, without the...