What kind of filter do you have? If its a power filter, you don't need an airpump. The filter should provide enough aeration. I personally don't like airpumps because they are noisy.
I'm not sure what the switch is for.
Have you checked your water parameters (ammonia, nitrite, and nitrates) since you moved him to a new tank? Did you cycle the tank?
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*Kristin*
5 Planted tanks:
55g, 40g, 29g, 20g, 5.5g
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