I'm definitely planning on including a heater, so no worries there.
Is there an HOB or in-tank filter out there that's both effective for a 2g tank and very small (or easily hideable)?
And any ideas for 2g or so nano tanks? I'd love a good-looking rimless of some sort, probably a cube...
Also, I'm thinking this would be a good opportunity to try out the dry start method, if there are any plants that would work well with DSM and (fairly direct) sunlight. Any thoughts?
Will the tank be right against the window? if so be mindful that its colder closer to the window then a few feet away from it, in winter the heater will have to work harder to warm the tank. Does the window have shades/blinds/curtians/tinting etc anything blocking/reducing light coming in?
Yes, it would be on the window sill. Fortunately I'm in Georgia, so winter is comparatively mild.
The location also means whatever tank I get can't be more than 10 inches deep.
A 1-2g is too small for sparkling gourami.
I'll stick with a betta then, unless anyone has other ideas for single fish that would do well in a 1-2g tank.