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Title: Yikes! It burbs!
Review: I wouldn't recommend the undergravel filter with only one bubble tube, the problem being that air bubbles build up underneath the filter in the corners and suddenly erupt with a BURP spewing debris and huge air bubbles up and out through the gravel, my poor Silver Dollars think they are under attack and smack into the glass! My other tank has a filter with a tube in each corner and it works perfect, going to buy that one now, poor fish!
