Neon tubes? Do you mean fluorescent? 75 watts in a 180 litre (~50 gallon) should be ok for some plants (right Liath?) but a third tube would probably be helpful... Specifically any kind of plant grow light with full spectrum coverage... I think you're supposed to have about 1 watt per gallon for an unplanted tank, and two or three times that for a planted one...
I am not a plant expert, and this fourm is really mainly for computer fish, but there are a couple people here that can probably help better than myself...
I don't watch commercials.
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