gravel or sand substrate?

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gravel or sand substrate? Empty gravel or sand substrate?

Post by rocksteady on May 13th 2014, 4:06 am

I've owned a few tropical reef aquariums but never a temperate. are the denitrifying bacteria found in sand beds more prominent in tropical environments or are they just as useful in cold water? I have an idea to build a system with a gravel bed sitting on a grate with the main drain underneath to keep the bed clean. I don't know if this is more or less beneficial than a sand bed when it comes to temperate marine. I really know nothing about this side of the hobby but I'm very interested. Any suggestions or even general pros and cons between the 2 are appreciated.
Fish Fry

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