Wouldn't worry about cleaning what stuck to the inside unless its real bad. but I am with the rest the barely straw is for bad case of string algae . but I believe it to be a pacifier more then a fix . and the pond clarifier may benefit some cases but I believe it to to be a band aid. Anyone with a small set up i would look at something like a bog in a bucket or a window box. throw a lotus and only stone no soil and pump your pond water to it they grow so fast and crazy they may solve the issues you haveIt’s a UV light cleaner. It definitely needs to be cleaned out. Just trying to research how to clean it. I figured out how to change the light just not how to clean the whole tube itself .
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