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This is why mixing two different types of sands (especially different grades (size)) typically doesn't work very well. All of the larger grains of sand will end up at the bottom, and the finer stuff will work it's way to the top.

If the 25lb bag was enough to cover the bottom of your tank with an inch or two of sand, I would let the finer stuff make it's way back to the top and siphon/vacuum it out.

Or, if you want to keep both sands in the tank you'll have to keep mixing them back together every now and then.

The only problem that I can think of is with your filters. If you're using a HOB filter, you might consider putting a pre-filter sponge over the intake so sand doesn't get pulled into your impeller. That will give you a headache. Raising the intake so it's 6+ inches off the top of the sand would also work, but sand may still find it's way into the impeller housing.
 

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HOB filter = Hang On Back, also called a Power Filter. Your Penguin 150B is a HOB filter. I can tell you from experience that when you get sand into the impeller housing a Penguin, it causes a ruckus. Everything I tried didn't work, even putting vaseline around the impeller. I ended up having to buy a new impeller (thankfully they aren't expensive).

You don't have to shut the filter off... unless you're cleaning the tank. Then you'll want to shut it off, do your cleaning, let the sand settle, then turn it back on.
 
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