Push in the glass pipes a little bit, then pull it out from the hose (push in part important, because it'll be easier to pull out the pipes) and use the spring brush to clean it. Buy the spring brush (make sure it is correct size for ur pipes) from fish store. From experience, ADA spring brush is the most flexible and easiest to use. From what I see from your picture, I guess your pipes are 10mm pipes. If I'm not wrong, only ADA have a brush that small.
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