Yep, that's the Diatom Filter I remember. I moved 4 times in the past 40 years and with each move came a new tank. I seeded each tank with the original Dolomite and even used some water to avoid cycling the new tanks. But only a small percentage Dolomite remains in each of my tanks and I now use Aragonite. But a piece of that original 55 gallon tank still lives in my newer tanks. One more move in my future will be my biggest tank ever, somewhere between 150-300 gallons. And I also plan on taking the Clownfish breeding to another level. Maybe even be able to make a few bucks. We'll see.
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