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I have play sand in my 55 gallon. To wash it, I put about 2 gallons worth in a bucket, filled it with water, stirred until all the sand dissolved, let it sit for 30 seconds then dumped the water. Then I had to do that about 6-8 more times. On the same 2 gallons of sand. Then I moved to the next 2. It takes a lot of work. If it's clouding the tank that bad, it needs cleaned more. I've had no problems getting mine to settle after cleaning it that much. The goal is to have all of the sand settle in 30 seconds to a minute. What is happening is the smaller particles are clouding it and won't sink. It won't change unless you take them out. Every time the slightest disturbance happens, it'll cloud again. I'd rewash it.
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