i think that at a temp of max 24degrees, HC and hairgrass would grow pretty well.
You should read this thread before starting your tank if you want to skip the hassle and disappointment of your HC dying. http://www.aquaticquotient.com/forum...ad.php?t=42183
Another plant that would do well in that temperature would be the US Fissiden. Personally I like it a lot and it looks great when well grown on driftwood or bogwood.
The absence of sunlight would not be a problem if your lights are strong enough. A rough guide would be to have at least 3watts per gallon.
Can I suggest that you get some shrimps too, they like cold water, but you might want to consider not switching your aircon too cold. NOt sure if 18deg would be too cold. Don't you feel cold at 18degrees too?
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