CAN YOU GUESS.....

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Dr. Dendrostein

Dr. Dendrostein

Marine fish monthly
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Okay here's the next clue I'm taking off the hat and see if someone can figure out what this accessory is for aquariums, been around since the 1970s and I believe they stopped making it after 2000.

IMG_20201026_063741967.jpg
 

andrewkw

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We have a winner :)

If the prize is a devo face shield I will PM you my address :)

I've never used a diatom filter as they are a little bit before my time, but vaguely recall some people using them to polish water.
 
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