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Hello everyone! I was wondering if Tahitian Black Moon Sand or Small, Round Pea Gravel would be better for my tank?

I am currently cycling a 37 gallon Eclipse tank. I would like to have 5-6 cory cats & possibly a bristlenose pleco. Currently, I have black gravel (not rounded pea gravel, just your standard colored gravel that you purchase at a fish store). I undertsand that this can be a bit sharp for the cory cats. So, I would like to go ahead and make a switch to small, rounded pea gravel or tahitian black moon sand. Which would you recommend?

Additionally, would I be able to "vaccum" sand like I am able to vaccum gravel? Many thanks for your advice! :)
 

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sand looks nice and has more surface area than gravel but it is harder to keep since they can compact over time making anearobic spots. But either ones fine
 

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If you using a ugf, small round gravel is the only way to go. You will restrict water flow with sand. Gravel size should be around 3/16" or 5cm. Sand will also eat up a power filters with extremely high water flow unless a prefilter is used. If you gravel is too small, or you use sand, compaction is a big problem if you don't stir the bottom regularly.
 
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