20 Long good idea?

Jan 9, 2005
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I think i'm going to move my 10 gallon nano into a 20 gallon. But i'm not really sure if it's better to go 20 long or 20 standard.

right now i'm leaning towards 20 long, should be easier to get light through to the bottom and i dont think i'll need to buy much more rock (in terms of aquascaping). But does anyone forsee any problems with this, like will the lights heat the tank a lot more or will it be harder to get enough water movement?