How much soil for tank

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Juwelrio
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So missus has decided she wants the fluval chi planted with a betta. So how much soil would I need for it to cover the bottom. It’s a 12” cube only 19l. Tried looking but don’t know how much would be enough to get 2 cm don’t want to order too much or not enough.

Will be lots of questions as soil and planted tanks are very new to me. Thanks in advance
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Martinspuddle
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If it was me, 5-6 cm at the front and 10-12 cm at the back.

Sounds a lot, but remember the soil will compact down over time.
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VikingMummy2015
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George Farmer recommends 6kg for the 57L flex. I had 9kg and did my flex and my old 29L with it. So 3kg bag should just about do it.
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Juwelrio
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So is it soil then a substrate like the lava stones gravel stuff on top
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plankton
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Don't use anything sharp like lava stone/rock with bettas, they're likely to catch their fins on it. ;)
Just cover with sand.
Juwelrio
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Seen natural volcanic substrate is that ok for planted tanks or do I need soil as well.
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