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I have recently been running an air stone in my open top, heavily planted 30 gallon during the night. The fish seem to like it, and it gives me piece of mind not having to wonder if the little guys are all gasping at the surface while I'm asleep.

Anyway, the problem is that I wake up in the morning to a bunch of water on the acrylic light fixture cover. The air bubbles hitting the surface all night create an effect similar to frying bacon. Tiny, tiny particles of water dance on the surface and over time are enough to get my light's cover soaked.

Anybody have this problem? Is my air pump too strong or something? I could probably tone it down... I have the tetra 40, when I really could get away with much smaller.

Thanks.
 

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Even CO2 bubbles do that when they pop at the water surface. I used to be able to look through the air above my tank and see the cloud of water droplets above the water. If the light fixture hangs a few inches above the tank the droplets don't do any harm.
 
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