Covering the tank means you cant get a good gas exchange and gas release at the surface. I can see useing the bubbler while covered but this would trap the release of nitrogen leading to higher ammonia amoung others?
Originally Posted by cmor1701d
He was referring to having an air line a covered QT tank, not a bubbler in a display tank. I agree with you about it being an eyesore in a display tank. I've seen that in the ocean unless it was from a scuba diver, and even then it was very temporary <g>