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depends do u want live plants cause they need 3-4 inchs. i have seen bare bottom tanks with zero gravel. so im guessing it up to up and what you like and want
 
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3'' is perfect IMO, but if you dont have cichlids or live plants, then a more shallow gravel bed will help keep your tank cleaner and wont harbour as many "nasties".
 

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3'' is perfect IMO, but if you dont have cichlids or live plants, then a more shallow gravel bed will help keep your tank cleaner and wont harbour as many "nasties".
Actually with live plants, 3" is about the shallowest I would recommend going. A lot of times if you are doing a lot of aquascaping you may get anywhere up to 7" deep to get the right look.
 

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Agreed ^^^

If your tank is not planted, then any depth is fine. However, if you are going to have a planted tank then 3" - 7" will be needed. Personally, I have a 3" mixed gravel bed.
 

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my 35 i used to have about 3"....for non planted you can go from zero to 3-4" if you want, depending on the look your trying to get too
 
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3'' is perfect IMO, but if you dont have cichlids or live plants, then a more shallow gravel bed will help keep your tank cleaner and wont harbour as many "nasties".
Actually with live plants, 3" is about the shallowest I would recommend going. A lot of times if you are doing a lot of aquascaping you may get anywhere up to 7" deep to get the right look.
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Well its hard to judge...I usually had about an inch at the front then near 7 inches mounded up against the back of the tank, where my larger plants were. The old "depth" trick.
 

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Allergic to stupid sh*t!!!
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General rule is 1lb per gallon
 

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LionHart
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I don't know where you read 1/4 inch... but that's ridiculously shallow.
 

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General rule is 1lb per gallon
That is the rule for general stuff... for plants though you usually use more depending on the density of your substrate. For my 125g, I have about 180lbs of substrate and could go for another 20-40lbs of it. On the other hand, in my 75g I have Soilmaster and 50lbs was more than enough to do the whole tank.
 
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