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This is a discussion on Marbles?! within the Beginner Freshwater Aquarium forums, part of the Freshwater Fish and Aquariums category; --> what if one used a granite slab as substrate for egg layers tank. I think it would be very intersting...

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Old 03-18-2011, 07:38 PM   #11
 
what if one used a granite slab as substrate for egg layers tank. I think it would be very intersting
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Old 03-18-2011, 11:20 PM   #12
 
Question What about agates.

I collect and polish agates and rocks. I want to know if they are ok to put into tank. On top of the regular gravel not just the rocks.
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Old 03-19-2011, 08:37 AM   #13
 
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what if one used a granite slab as substrate for egg layers tank. I think it would be very intersting
Provided there is a base of gravel, with the granite slab pushed down into it so as to leave no accessible areas under the slab, fine. I have used pieces of slate partially set into the gravel in tanks to create open areas where plants would otherwise spread.
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Old 03-19-2011, 08:38 AM   #14
 
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I collect and polish agates and rocks. I want to know if they are ok to put into tank. On top of the regular gravel not just the rocks.
Agates are probably fine. Other rocks too, provided they are not calcareous as this would raise hardness and corresponding pH that is fine in livebearers and rift lake cichlid tanks but not in soft water fish tanks.
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Old 03-19-2011, 10:01 AM   #15
 
I might get some slate today so we will see how that goes
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Old 03-19-2011, 10:19 AM   #16
 
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I might get some slate today so we will see how that goes
I probably should have asked previously what the intention was behind this, as there is something i forgot to mention, and that is dead spots. Any slab of rock laid on the substrate will cause a dead spot beneath it, where anaerobic bacteria will occur. OK in itself if limited, but too many such spots can cause nitrogen gas to build up and harm if not kill fish and plants. When I used the slate, it was small bits, maybe 4-5 inches by 2 inches max, and only a couple. Just to keep clear areas in front for feeding corys, as the pygmy chain swords sent out runners so fast I was trying to keep them aways from a couple areas.
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Old 03-19-2011, 02:00 PM   #17
 
so to prevent this would I just move around the rocks every water change or what should I do. Is there a way to prevent this or do I have to jsut deal with it?
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Old 03-19-2011, 02:07 PM   #18
 
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so to prevent this would I just move around the rocks every water change or what should I do. Is there a way to prevent this or do I have to jsut deal with it?
If you want a chunk of rock as "the" substrate, I would place it on the tank bottom and then push the substrate gravel/sand around it. So that the rock itself is at the bottom with no substrate matter under it to cause trouble.

A few rocks or pieces of wood here and there is no real issue. I got the impression that you were thinking of a significant area of the substrate being this large rock, and that should be on the tank bottom.
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Old 03-19-2011, 02:37 PM   #19
 
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I'm not exactly sure how I feel about play sand, but if you are considering using something like one huge piece of slate on the bottom, I would definately place about a half inch of sand on the bottom first to cushion the rock and protect the bottom pane of glass in the tank...
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Old 03-20-2011, 10:12 AM   #20
 
I was not planning on doing this but just curiosity brought the question up.
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