Another plus to increased surface agitation is that it can contribute (in a small way) to cooling the tank via evaporative cooling.
As with all loaches, water quality must be very good. I suspect you knew that already.
As for the twirling (first poster) -- if there are changes in barometric pressure, dojos tend to go crazy. They can twirl and race around the tank and dart up and down, becoming little acrobats. It could be that your loach was simply reacting to changes in weather, hence the name "weather loach".
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