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Old 10-30-2018, 12:34 PM   #1
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making hills

I have some used reef rocks (a lot really) I was wondering how bad of an idea would it be to make small hills out of them.? Covering them in at least an 1.5 in of dirt and another 1.5 - 2 of PFS.
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Old 10-30-2018, 12:51 PM   #2
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They will buffer your pH to 8.2
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Old 10-30-2018, 01:04 PM   #3
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Not a bad idea, it will have some buffering action in the water. My big concern is creating dead zones for pockets of gas. Typically not an issue in a tank, but there will be a lot of buildup with that much buried surface area.
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Old 10-30-2018, 03:03 PM   #4
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Isn't reef rock very porous with deep / small pores?

If so it could create anaerobic populations....
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Old 10-30-2018, 03:08 PM   #5
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Isn't reef rock very porous with deep / small pores?

If so it could create anaerobic populations....
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Old 10-31-2018, 12:30 AM   #6
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You could view anaerobic conditions as a potential method of nitrate reduction or a hydrogen sulfide source or both. Excess nitrates are not usually an issue in a planted tank.
You could use panty hose filled with lava rock. Inert, lightweight, porous, and inexpensive.
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Old 10-31-2018, 12:53 AM   #7
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Second thought, the sand and dirt will eventually settle out exposing the rock.
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