05-11-2012, 11:22 AM
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Answering your last two posts, last one first. If there are live plants, I would go with minimal water movement. In a 10g I use a single sponge filter, the Hagen Elite is my favourite because it can be attached to a rear corner at any hight (is adjustable). I use this in my 10g, and a dual Elite in both my 20g and 29g, and the tanks are crystal clear.
To the earlier question on fish, with your soft water I would have plants and some of the "dwarf" species that do so well in 10g tanks but get lost in larger. I think this came up in another thread, but if not just have a look at the Cyprinids section in the profiles, the characins (Ember T, some pencilfish), Badids, Anabantids and Atherinids. There are some dwarf species in all of these.